Question

Solve 5r2 – 12 = 68.

Answer 1

`5r^(2)` - 12 = 68

`5r^(2)` = 68 + 12

`5r^(2)` = 80

`r^(2)` = 80 ÷ 2

`r^(2)` = 16
r =
`√(16)`
r = 4 or -4

So r = 4 or -4

Answer 2

the solution to the equation is r= the square root of 56(b+2)