Question 224940
First, x^2 is a way of indicating the square of x. The ^ means "raise to the power" and the number is the exponent.
{{{f(x) = 4x^2-7}}} To find {{{f(1/2)}}}, substitute {{{x = 1/2}}}
{{{f(1/2) = 4(1/2)^2-7}}}
{{{f(1/2) = 4(1/4)-7}}}
{{{f(1/2) = 1-7}}}
{{{highlight(f(1/2) = -6)}}}