h(2)=4.2(2)-3

Solution for h(2)=4.2(2)-3 equation:

h(2)=4.2(2)-3

We move all terms to the left:

h(2)-(4.2(2)-3)=0

We add all the numbers together, and all the variables

h2-(1.22)=0

We add all the numbers together, and all the variables

h^2-1.22=0

a = 1; b = 0; c = -1.22;
Δ = b2-4ac
Δ = 02-4·1·(-1.22)
Δ = 4.88
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{4.88}}{2*1}=\frac{0-\sqrt{4.88}}{2}
=-\frac{\sqrt{}}{2}
$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{4.88}}{2*1}=\frac{0+\sqrt{4.88}}{2}
=\frac{\sqrt{}}{2}
$