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(5-3x)(4-7x)=(5-3x)(2+x)
We move all terms to the left:
(5-3x)(4-7x)-((5-3x)(2+x))=0
We add all the numbers together, and all the variables
(-3x+5)(-7x+4)-((-3x+5)(x+2))=0
We multiply parentheses ..
(+21x^2-12x-35x+20)-((-3x+5)(x+2))=0
We calculate terms in parentheses: -((-3x+5)(x+2)), so:We get rid of parentheses
(-3x+5)(x+2)
We multiply parentheses ..
(-3x^2-6x+5x+10)
We get rid of parentheses
-3x^2-6x+5x+10
We add all the numbers together, and all the variables
-3x^2-1x+10
Back to the equation:
-(-3x^2-1x+10)
21x^2+3x^2-12x-35x+1x+20-10=0
We add all the numbers together, and all the variables
24x^2-46x+10=0
a = 24; b = -46; c = +10;
Δ = b2-4ac
Δ = -462-4·24·10
Δ = 1156
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{1156}=34$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-46)-34}{2*24}=\frac{12}{48} =1/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-46)+34}{2*24}=\frac{80}{48} =1+2/3 $
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