4x*7x=700

Solution for 4x*7x=700 equation:

4x*7x=700

We move all terms to the left:

4x*7x-(700)=0

Wy multiply elements

28x^2-700=0

a = 28; b = 0; c = -700;
Δ = b2-4ac
Δ = 02-4·28·(-700)
Δ = 78400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{78400}=280$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-280}{2*28}=\frac{-280}{56}
=-5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+280}{2*28}=\frac{280}{56}
=5
$