x*x=16/25

Solution for x*x=16/25 equation:

x*x=16/25

We move all terms to the left:

x*x-(16/25)=0

We add all the numbers together, and all the variables

x*x-(+16/25)=0

Wy multiply elements

x^2-(+16/25)=0

We get rid of parentheses

x^2-16/25=0

We multiply all the terms by the denominator


x^2*25-16=0

Wy multiply elements

25x^2-16=0

a = 25; b = 0; c = -16;
Δ = b2-4ac
Δ = 02-4·25·(-16)
Δ = 1600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1600}=40$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-40}{2*25}=\frac{-40}{50}
=-4/5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+40}{2*25}=\frac{40}{50}
=4/5
$