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x(x+10)+7(x+10)=0
We multiply parentheses
x^2+10x+7x+70=0
We add all the numbers together, and all the variables
x^2+17x+70=0
a = 1; b = 17; c = +70;
Δ = b2-4ac
Δ = 172-4·1·70
Δ = 9
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{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(17)-3}{2*1}=\frac{-20}{2} =-10 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(17)+3}{2*1}=\frac{-14}{2} =-7 $
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