Question

What is 5r^2 = 80

It says solve each equation with the quadratic formula.

Answer 1

`5r^2 = 80 \ \ /:5\\ \\r^2=(80)/(5)\\ \\r^2=16\\ \\r^2-16=0\\ \\ r^2 - 4^2 =0 \\ \\(r-4)(r+4)=0`


`r-4=0 \ \ \vee \ \ r+4 =0 \\ \\r=4 \ \ \vee \ \ r = -4 \\ \\ \\ a^2-b^2 = (a- b)(a+b)`