Question

Heeeeellllpppppppppppp!!!!

Evaluate the function for x=m/4

A. 2m^2-m
B. m^2-m
C. m^2/2-4m
D. m^2/2-m

Answer 1

$f(x)=8x^2-4x\\\\\text{substitute}\ x=\dfrac{m}{4}\\\\f\left(\dfrac{m}{4}\right)=8\cdot\left(\dfrac{m}{4}\right)^2-4\cdot\dfrac{m}{4}=8\cdot\dfrac{m^2}{16}-m=\dfrac{m^2}{2}-m$

$\text{Answer:}\ D.\ \dfrac{m^2}{2}-m$