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(5x+9)(2x+7)=10x+53x+63
We move all terms to the left:
(5x+9)(2x+7)-(10x+53x+63)=0
We add all the numbers together, and all the variables
(5x+9)(2x+7)-(63x+63)=0
We get rid of parentheses
(5x+9)(2x+7)-63x-63=0
We multiply parentheses ..
(+10x^2+35x+18x+63)-63x-63=0
We get rid of parentheses
10x^2+35x+18x-63x+63-63=0
We add all the numbers together, and all the variables
10x^2-10x=0
a = 10; b = -10; c = 0;
Δ = b2-4ac
Δ = -102-4·10·0
Δ = 100
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{100}=10$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-10}{2*10}=\frac{0}{20} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+10}{2*10}=\frac{20}{20} =1 $
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