Question

Which among the folllowing is a factor of 3x³-4x²-6x+7

• A. x+2
• B. x-2
• C. x+1
• D. x-1

Answer 1

Answer:

D. x-1

(x-a) is a factor of p(x) if p(a)=0 p(-2) = 3(-2)³-4(-2)²-6(-2)+7 = 21 p(2) = 3(2)³-4(2)²-6(2)+7 = 3 p(-1) = 3(-1)³-4(-1)²-6(-1)+7 = 6 p(1) = 3(1)³-4(1)²-6(1)+7 = 0 therefore ans (x-1)