2(7x+1)+100=-x2+57

Solution for 2(7x+1)+100=-x2+57 equation:

2(7x+1)+100=-x2+57

We move all terms to the left:

2(7x+1)+100-(-x2+57)=0

We add all the numbers together, and all the variables

-(-1x^2+57)+2(7x+1)+100=0

We multiply parentheses

-(-1x^2+57)+14x+2+100=0

We get rid of parentheses

1x^2+14x-57+2+100=0

We add all the numbers together, and all the variables

x^2+14x+45=0

a = 1; b = 14; c = +45;
Δ = b2-4ac
Δ = 142-4·1·45
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-4}{2*1}=\frac{-18}{2}
=-9
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+4}{2*1}=\frac{-10}{2}
=-5
$