7x^2-144x-63=0

Solution for 7x^2-144x-63=0 equation:

7x^2-144x-63=0

a = 7; b = -144; c = -63;
Δ = b2-4ac
Δ = -1442-4·7·(-63)
Δ = 22500
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{22500}=150$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-144)-150}{2*7}=\frac{-6}{14}
=-3/7
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-144)+150}{2*7}=\frac{294}{14}
=21
$