Question

How do you solve `-9x ^ { 2} - 5= - 77`?

Answer 1

We have `-9x^2 -5 = -77`

`implies -9x^2 = -77 + 5`
`implies -9x^2 = -72`

Dividing with `9`,

`-x^2 = -72/9`
`implies x^2 = 8`

`implies x = +2(2)^(1/2)` and `x=-2(2)^(1/2)`

These are our solutions.