7x-(25x2+12x)=

Solution for 7x-(25x2+12x)= equation:

7x-(25x^2+12x)=

We move all terms to the left:

7x-(25x^2+12x)-()=0

We add all the numbers together, and all the variables

7x-(25x^2+12x)=0

We get rid of parentheses

-25x^2+7x-12x=0

We add all the numbers together, and all the variables

-25x^2-5x=0

a = -25; b = -5; c = 0;
Δ = b2-4ac
Δ = -52-4·(-25)·0
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-5}{2*-25}=\frac{0}{-50}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+5}{2*-25}=\frac{10}{-50}
=-1/5
$