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What is the coefficient of x^2 in (2x-1)(x^2-3x+4)?

Answer and explanation

Correct answer: -7

The governing concept is multiplication of polynomials followed by combining like powers. Distribute each term of the first factor: 2x(x^2 − 3x + 4) = 2x^3 − 6x^2 + 8x, and −1(x^2 − 3x + 4) = −x^2 + 3x − 4. The x^2 terms are −6x^2 and −x^2, so their coefficients combine to −6 − 1 = −7. The complete product is 2x^3 − 7x^2 + 11x − 4. Therefore option A is correct. Option B counts only the product of 2x and −3x and misses the contribution from (−1)(x^2). Option D belongs to the x-term, while option C does not result from collecting all x^2 terms.

Related tags

PolynomialsMultiplicationCoefficientsLike-TermsPolynomials In One VariableMathematicsClass 10 Mcq

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