5x*7x=140

Solution for 5x*7x=140 equation:

5x*7x=140

We move all terms to the left:

5x*7x-(140)=0

Wy multiply elements

35x^2-140=0

a = 35; b = 0; c = -140;
Δ = b2-4ac
Δ = 02-4·35·(-140)
Δ = 19600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{19600}=140$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-140}{2*35}=\frac{-140}{70}
=-2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+140}{2*35}=\frac{140}{70}
=2
$