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3(x-2)(x+2)-5(x+2)=(x+2)(3x-11)
We move all terms to the left:
3(x-2)(x+2)-5(x+2)-((x+2)(3x-11))=0
We use the square of the difference formula
x^2-5(x+2)-((x+2)(3x-11))-4=0
We multiply parentheses
x^2-5x-((x+2)(3x-11))-10-4=0
We multiply parentheses ..
x^2-((+3x^2-11x+6x-22))-5x-10-4=0
We calculate terms in parentheses: -((+3x^2-11x+6x-22)), so:We add all the numbers together, and all the variables
(+3x^2-11x+6x-22)
We get rid of parentheses
3x^2-11x+6x-22
We add all the numbers together, and all the variables
3x^2-5x-22
Back to the equation:
-(3x^2-5x-22)
x^2-5x-(3x^2-5x-22)-14=0
We get rid of parentheses
x^2-3x^2-5x+5x+22-14=0
We add all the numbers together, and all the variables
-2x^2+8=0
a = -2; b = 0; c = +8;
Δ = b2-4ac
Δ = 02-4·(-2)·8
Δ = 64
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{64}=8$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8}{2*-2}=\frac{-8}{-4} =+2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8}{2*-2}=\frac{8}{-4} =-2 $
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