4x2+-30x+-7000=0

Solution for 4x2+-30x+-7000=0 equation:

4x^2+-30x+-7000=0

We add all the numbers together, and all the variables

4x^2-30x=0

a = 4; b = -30; c = 0;
Δ = b2-4ac
Δ = -302-4·4·0
Δ = 900
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{900}=30$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-30}{2*4}=\frac{0}{8}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+30}{2*4}=\frac{60}{8}
=7+1/2
$