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What will be the coefficient of (x) in the difference of (3x^2+2x-5) and (x^2-4x+7)?

Answer and explanation

Correct answer: (6)

To find the difference, subtract the entire second polynomial from the first one. The subtraction sign before the bracket changes every sign inside that bracket: x² becomes -x², -4x becomes +4x, and +7 becomes -7. Combining like terms gives 3x² - x² = 2x², 2x + 4x = 6x, and -5 - 7 = -12. The difference is therefore 2x² + 6x - 12.

The coefficient of x is the number multiplying x, so it is 6. Hence choice A is correct. Choosing 2 would mean forgetting that subtracting -4x creates +4x; choosing 4 would retain only the second polynomial’s changed contribution and ignore the original 2x term.

Related tags

SubtractionCoefficientQuadratic Expressions

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