4x^2-60-225=0

Solution for 4x^2-60-225=0 equation:

4x^2-60-225=0

We add all the numbers together, and all the variables

4x^2-285=0

a = 4; b = 0; c = -285;
Δ = b2-4ac
Δ = 02-4·4·(-285)
Δ = 4560
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{4560}=\sqrt{16*285}=\sqrt{16}*\sqrt{285}=4\sqrt{285}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{285}}{2*4}=\frac{0-4\sqrt{285}}{8}
=-\frac{4\sqrt{285}}{8}
=-\frac{\sqrt{285}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{285}}{2*4}=\frac{0+4\sqrt{285}}{8}
=\frac{4\sqrt{285}}{8}
=\frac{\sqrt{285}}{2}
$