(2x+)x+25=90

Solution for (2x+)x+25=90 equation:

(2x+)x+25=90

We move all terms to the left:

(2x+)x+25-(90)=0

We add all the numbers together, and all the variables

(+2x)x+25-90=0

We add all the numbers together, and all the variables

(+2x)x-65=0

We multiply parentheses

2x^2-65=0

a = 2; b = 0; c = -65;
Δ = b2-4ac
Δ = 02-4·2·(-65)
Δ = 520
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:

$\sqrt{\Delta}=\sqrt{520}=\sqrt{4*130}=\sqrt{4}*\sqrt{130}=2\sqrt{130}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{130}}{2*2}=\frac{0-2\sqrt{130}}{4}
=-\frac{2\sqrt{130}}{4}
=-\frac{\sqrt{130}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{130}}{2*2}=\frac{0+2\sqrt{130}}{4}
=\frac{2\sqrt{130}}{4}
=\frac{\sqrt{130}}{2}
$