Free · Class 10 · 6 worksheets · answer keys · practise online · set 20
Quadratic equations worksheets — Class 10, with answers
Free Class 10 quadratic equations worksheets: solve by factorisation, quadratic formula, nature of roots (discriminant), find k for equal roots and word problems — with answers.
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A quadratic equation is ax² + bx + c = 0 (a ≠ 0). It has at most two roots. Factorisation : split the middle term — x² − 5x + 6 = (x − 2)(x − 3) = 0 → x = 2 or 3.Quadratic formula : x = (−b ± √D) / 2a, where D = b² − 4ac . D > 0: two distinct real roots; D = 0: equal roots; D < 0: no real roots.
Solve by factorisation (Class 10) Factorisation (a ≠ 1) (Class 10) Nature of roots (Class 10) Quadratic formula (Class 10) Find k (Class 10) Word problems (Class 10)
Solve by factorisation Class 10 · Worksheet 1 · set 20
Name: Date: Score: / 10
Solve.
x² − 7x − 18 = 0 x² − 5x + 6 = 0 x² − 18x + 81 = 0 x² − 16x + 63 = 0 x² + 12x + 32 = 0 x² − 5x − 24 = 0 x² − 49 = 0 x² − 81 = 0 x² − 25 = 0 x² − 4x + 4 = 0
✅ Answer key — Solve by factorisation
x = −2 or x = 9 x = 2 or x = 3 x = 9 (equal roots) x = 7 or x = 9 x = −8 or x = −4 x = −3 or x = 8 x = −7 or x = 7 x = −9 or x = 9 x = −5 or x = 5 x = 2 (equal roots) TalentJR · talentjr.in/quadratic-equations-worksheet
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Factorisation (a ≠ 1) Class 10 · Worksheet 2 · set 20
Name: Date: Score: / 8
Solve by splitting the middle term.
5x² − 8x − 21 = 0 3x² + 31x + 36 = 0 4x² + 21x + 20 = 0 2x² − 17x − 9 = 0 2x² + 13x − 7 = 0 4x² − 37x + 40 = 0 4x² + 39x + 56 = 0 5x² + 24x + 27 = 0
✅ Answer key — Factorisation (a ≠ 1)
x = −7/5 or x = 3 x = −9 or x = −4/3 x = −4 or x = −5/4 x = −1/2 or x = 9 x = −7 or x = 1/2 x = 5/4 or x = 8 x = −8 or x = −7/4 x = −3 or x = −9/5 TalentJR · talentjr.in/quadratic-equations-worksheet
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Nature of roots Class 10 · Worksheet 3 · set 20
Name: Date: Score: / 8
Find the discriminant and the nature of the roots.
Nature of the roots of 2x² + 2x + 1 = 0 Nature of the roots of 3x² + 5x − 2 = 0 Nature of the roots of 4x² + 5x − 3 = 0 Nature of the roots of x² + 5x − 1 = 0 Nature of the roots of 4x² + 2x − 1 = 0 Nature of the roots of 4x² − 8x − 1 = 0 Nature of the roots of 5x² + 9x − 4 = 0 Nature of the roots of 5x² + 7x + 6 = 0
✅ Answer key — Nature of roots
D = −4 → no real roots D = 49 → two distinct real roots D = 73 → two distinct real roots D = 29 → two distinct real roots D = 20 → two distinct real roots D = 80 → two distinct real roots D = 161 → two distinct real roots D = −71 → no real roots TalentJR · talentjr.in/quadratic-equations-worksheet
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Quadratic formula Class 10 · Worksheet 4 · set 20
Name: Date: Score: / 6
Solve using the quadratic formula.
Solve by the quadratic formula: x² − 3x − 7 = 0 Solve by the quadratic formula: 4x² + x − 9 = 0 Solve by the quadratic formula: 3x² − 4x − 8 = 0 Solve by the quadratic formula: x² + 6x + 7 = 0 Solve by the quadratic formula: 3x² + x − 5 = 0 Solve by the quadratic formula: x² + 7x − 6 = 0
✅ Answer key — Quadratic formula
x = (3 ± √37)/2 (≈ 4.54, −1.54) x = (−1 ± √145)/8 (≈ 1.38, −1.63) x = (2 ± 2√7)/3 (≈ 2.43, −1.1) x = −3 ± √2 (≈ −1.59, −4.41) x = (−1 ± √61)/6 (≈ 1.14, −1.47) x = (−7 ± √73)/2 (≈ 0.77, −7.77) TalentJR · talentjr.in/quadratic-equations-worksheet
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Find k Class 10 · Worksheet 5 · set 20
Name: Date: Score: / 6
Solve.
Find k if x² + 14x + k = 0 has equal roots. Find k if x² + kx + 1 = 0 has equal roots. Find k if x² + 10x + k = 0 has equal roots. Find k if x² − 2x + k = 0 has equal roots. Find k if x² + 4x + k = 0 has equal roots. Find k if x² − 4x + k = 0 has equal roots.
✅ Answer key — Find k
k = 49 k = 2 or k = −2 k = 25 k = 1 k = 4 k = 4 TalentJR · talentjr.in/quadratic-equations-worksheet
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Word problems Class 10 · Worksheet 6 · set 20
Name: Date: Score: / 6
Form a quadratic equation and solve.
The sum of the squares of two consecutive positive integers is 421. Find the integers. The product of two consecutive positive integers is 812. Find the integers. The sum of the squares of two consecutive positive integers is 221. Find the integers. The length of a rectangular park is 2 m more than its width. Its area is 15 sq m. Find its length and width. The product of two consecutive positive integers is 342. Find the integers. The product of two consecutive positive integers is 930. Find the integers.
✅ Answer key — Word problems
14 and 15 28 and 29 10 and 11 width 3 m, length 5 m 18 and 19 30 and 31 TalentJR · talentjr.in/quadratic-equations-worksheet
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Questions
What is the discriminant? D = b² − 4ac. It tells the nature of the roots without solving: positive → two real roots, zero → equal roots, negative → no real roots.
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