SOLUTION: if f(x)=x^2-7x-4, then the value of f(2x+1)is a. 3x^2-18x+3 b. 4x^2+18x-3 c. 4x^2-10x-10 d. x^2+7x-3

Algebra ->  Inequalities -> SOLUTION: if f(x)=x^2-7x-4, then the value of f(2x+1)is a. 3x^2-18x+3 b. 4x^2+18x-3 c. 4x^2-10x-10 d. x^2+7x-3      Log On


   

Question 971185: if f(x)=x^2-7x-4, then the value of f(2x+1)is
a. 3x^2-18x+3
b. 4x^2+18x-3
c. 4x^2-10x-10
d. x^2+7x-3
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
if f(x)=x^2-7x-4, then the value of f(2x+1)is
a. 3x^2-18x+3
b. 4x^2+18x-3
c. 4x^2-10x-10
d. x^2+7x-3
Solution:
f(2x+1) = (2x+1)^2-7(2x+1)-4
= (4x^2 + 4x + 1) - 14x - 7 - 4
= 4x^2 - 10x - 10
Answer: c. 4x^2-10x-10