Question

check whether 2x+1 is factor of 4x³+4x²-x-1​

Answer 1

Answer:

clearly k=2, since the factors would be

(2x+1)(x-a)(x-b)

You don't even have to find a and b, since the only factors of 2 are 2,1,1

But, just to check,

2x^3 + 7x^2 + 2x - 3 = (2x+1)(x+1)(x+3)

oobleck

Apr 18, 2020

K(-1/8)+7/4-k/2-3=0

-k/8+7/4-k/2-3=0

-k/8-k/2=3-7/4

-k/2(1/4+1)=5/4

-k/2(5/4)=5/4

-k/2=1

K=-2