136=3.14*(x*x)*8.7

Solution for 136=3.14*(x*x)*8.7 equation:

136=3.14(x*x)*8.7

We move all terms to the left:

136-(3.14(x*x)*8.7)=0

We add all the numbers together, and all the variables

-(3.14(+x*x)*8.7)+136=0


We calculate terms in parentheses: -(3.14(+x*x)*8.7), so:

3.14(+x*x)*8.7

We multiply parentheses

27.318x^2

Back to the equation:

-(27.318x^2)


We get rid of parentheses

-27.318x^2+136=0

a = -27.318; b = 0; c = +136;
Δ = b2-4ac
Δ = 02-4·(-27.318)·136
Δ = 14860.992
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{14860.992}}{2*-27.318}=\frac{0-\sqrt{14860.992}}{-54.636}
=-\frac{\sqrt{}}{-54.636}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{14860.992}}{2*-27.318}=\frac{0+\sqrt{14860.992}}{-54.636}
=\frac{\sqrt{}}{-54.636}
$