240=3.14*(x*x)

Solution for 240=3.14*(x*x) equation:

240=3.14(x*x)

We move all terms to the left:

240-(3.14(x*x))=0

We add all the numbers together, and all the variables

-(3.14(+x*x))+240=0


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

3.14(+x*x)

We multiply parentheses

3.14x^2

Back to the equation:

-(3.14x^2)


We get rid of parentheses

-3.14x^2+240=0

a = -3.14; b = 0; c = +240;
Δ = b2-4ac
Δ = 02-4·(-3.14)·240
Δ = 3014.4
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{3014.4}}{2*-3.14}=\frac{0-\sqrt{3014.4}}{-6.28}
=-\frac{\sqrt{}}{-6.28}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{3014.4}}{2*-3.14}=\frac{0+\sqrt{3014.4}}{-6.28}
=\frac{\sqrt{}}{-6.28}
$