Question

I really need help please

Answer 1

Ah. Here is the theory to help you.
Given a quadratic equation

`ax^(2) + bx + c = 0`
the quadratic formula gives

`x = (-b \pm √(4ac))/(2a)`

So here, with your equation

`y = 4x^(2) - 3x - 9 = 0`
you have

`x = (-(-3) \pm √(4 * 4 * (-9)))/(2 * 4)`