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Which equation has roots x = 3 and x = 8?

Answer and explanation

Correct answer: x² − 11x + 24 = 0

To form a monic quadratic when the roots are 3 and 8, use the factor form (x − 3)(x − 8) = 0. Expanding gives x² − 8x − 3x + 24 = 0, and combining like terms produces x² − 11x + 24 = 0. Thus option A is correct. Vieta’s relations provide an independent check: for x² + bx + c = 0, the sum of the roots is −b and their product is c. The sum here is 3 + 8 = 11, so b must be −11; the product is 3 × 8 = 24, so c must be 24. Option B has the wrong sign for the x coefficient, option C reverses the sum and product, and option D has both an incorrect coefficient pattern and an incorrect constant sign.

Related tags

Quadratic-EquationsRootsForming-EquationRoots Of A Quadratic EquationQuadratic EquationsMathematicsClass 10 Mcq

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