Question

X=?f(x) = x2-1f(x) = 99

Answer 1

Let us find the value of x

`f(x)=x^2-1`

Since f(x) = 99, so substitute f(x) by 99 in the formula above

`99=x^2-1`

To solve the equation add 1 to both sides

`99+1=x^2-1+1`
`100=x^2`

To get x take a square root for both sides

`\pm√(100)\text{ = x}`

So the values of x are -10 , 10

For the square root there are to values one of them positive and the other is negative because -10 * -10 = 100 and