-4.5=-0.5x(x-7.1)

Solution for -4.5=-0.5x(x-7.1) equation:

-4.5=-0.5x(x-7.1)

We move all terms to the left:

-4.5-(-0.5x(x-7.1))=0


We calculate terms in parentheses: -(-0.5x(x-7.1)), so:

-0.5x(x-7.1)

We multiply parentheses

-0x^2+0x

We add all the numbers together, and all the variables

-1x^2+x

Back to the equation:

-(-1x^2+x)


We get rid of parentheses

1x^2-x-4.5=0

We add all the numbers together, and all the variables

x^2-1x-4.5=0

a = 1; b = -1; c = -4.5;
Δ = b2-4ac
Δ = -12-4·1·(-4.5)
Δ = 19
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{-(-1)-\sqrt{19}}{2*1}=\frac{1-\sqrt{19}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{19}}{2*1}=\frac{1+\sqrt{19}}{2}
$