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5(x^2-1)=4x
We move all terms to the left:
5(x^2-1)-(4x)=0
We add all the numbers together, and all the variables
-4x+5(x^2-1)=0
We multiply parentheses
5x^2-4x-5=0
a = 5; b = -4; c = -5;
Δ = b2-4ac
Δ = -42-4·5·(-5)
Δ = 116
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{116}=\sqrt{4*29}=\sqrt{4}*\sqrt{29}=2\sqrt{29}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-2\sqrt{29}}{2*5}=\frac{4-2\sqrt{29}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+2\sqrt{29}}{2*5}=\frac{4+2\sqrt{29}}{10} $
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