2a(2)=2(2)-6

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Solution for 2a(2)=2(2)-6 equation:



2a(2)=2(2)-6
We move all terms to the left:
2a(2)-(2(2)-6)=0
We add all the numbers together, and all the variables
2a2-16=0
We add all the numbers together, and all the variables
2a^2-16=0
a = 2; b = 0; c = -16;
Δ = b2-4ac
Δ = 02-4·2·(-16)
Δ = 128
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:
$\sqrt{\Delta}=\sqrt{128}=\sqrt{64*2}=\sqrt{64}*\sqrt{2}=8\sqrt{2}$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{2}}{2*2}=\frac{0-8\sqrt{2}}{4} =-\frac{8\sqrt{2}}{4} =-2\sqrt{2} $
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{2}}{2*2}=\frac{0+8\sqrt{2}}{4} =\frac{8\sqrt{2}}{4} =2\sqrt{2} $

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