4(x2.1)=7.2

Solution for 4(x2.1)=7.2 equation:

4(x2.1)=7.2

We move all terms to the left:

4(x2.1)-(7.2)=0

We add all the numbers together, and all the variables

4(+x2.1)-(7.2)=0

We add all the numbers together, and all the variables

4(+x2.1)-7.2=0

We multiply parentheses

4x^2-7.2=0

a = 4; b = 0; c = -7.2;
Δ = b2-4ac
Δ = 02-4·4·(-7.2)
Δ = 115.2
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{115.2}}{2*4}=\frac{0-\sqrt{115.2}}{8}
=-\frac{\sqrt{}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{115.2}}{2*4}=\frac{0+\sqrt{115.2}}{8}
=\frac{\sqrt{}}{8}
$