8x^2=18(18+42)

Solution for 8x^2=18(18+42) equation:

8x^2=18(18+42)

We move all terms to the left:

8x^2-(18(18+42))=0

We add all the numbers together, and all the variables

8x^2-(1860)=0

We add all the numbers together, and all the variables

8x^2-1860=0

a = 8; b = 0; c = -1860;
Δ = b2-4ac
Δ = 02-4·8·(-1860)
Δ = 59520
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:

$\sqrt{\Delta}=\sqrt{59520}=\sqrt{64*930}=\sqrt{64}*\sqrt{930}=8\sqrt{930}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{930}}{2*8}=\frac{0-8\sqrt{930}}{16}
=-\frac{8\sqrt{930}}{16}
=-\frac{\sqrt{930}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{930}}{2*8}=\frac{0+8\sqrt{930}}{16}
=\frac{8\sqrt{930}}{16}
=\frac{\sqrt{930}}{2}
$