evaluate the expression

Question

evaluate the expression for x=1/2

 

(x² - 4)/(x²+4)

Answer 1

Just plug 1/2 in for the x's and simplify.  If you're typing it in a calculator be sure to use parentheses around the (1/2)

 

((1/2)² - 4) ÷ ((1/2)² + 4)