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0=(8-2x)(11-2x)
We move all terms to the left:
0-((8-2x)(11-2x))=0
We add all the numbers together, and all the variables
-((-2x+8)(-2x+11))+0=0
We add all the numbers together, and all the variables
-((-2x+8)(-2x+11))=0
We multiply parentheses ..
-((+4x^2-22x-16x+88))=0
We calculate terms in parentheses: -((+4x^2-22x-16x+88)), so:We get rid of parentheses
(+4x^2-22x-16x+88)
We get rid of parentheses
4x^2-22x-16x+88
We add all the numbers together, and all the variables
4x^2-38x+88
Back to the equation:
-(4x^2-38x+88)
-4x^2+38x-88=0
a = -4; b = 38; c = -88;
Δ = b2-4ac
Δ = 382-4·(-4)·(-88)
Δ = 36
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{36}=6$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(38)-6}{2*-4}=\frac{-44}{-8} =5+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(38)+6}{2*-4}=\frac{-32}{-8} =+4 $
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