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What is the simplified polynomial form of (x+6)^2-(x-2)^2?

Answer and explanation

Correct answer: 16x+32

Answer: B, 16x+32. Use the difference-of-squares identity A^2−B^2=(A−B)(A+B). Here A=x+6 and B=x−2. First, A−B=(x+6)−(x−2)=8; be careful that subtracting x−2 changes the sign of both terms. Next, A+B=(x+6)+(x−2)=2x+4. Therefore the expression is 8(2x+4)=16x+32. By expansion, (x+6)^2=x^2+12x+36 and (x−2)^2=x^2−4x+4; subtraction cancels x^2 and gives 16x+32. A is wrong because the x-coefficient is half the correct value. B is correct. C has both an incorrect x-coefficient and constant term. D has incorrect coefficients. Memory cue: in a difference of squares, calculate both the difference and the sum; do not use only the difference.

Related tags

PolynomialsAlgebraic-IdentitiesDifference-Of-SquaresSimplificationPolynomials In One VariableMathematicsClass 10 Mcq

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