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(7+x)(12+x)=176
We move all terms to the left:
(7+x)(12+x)-(176)=0
We add all the numbers together, and all the variables
(x+7)(x+12)-176=0
We multiply parentheses ..
(+x^2+12x+7x+84)-176=0
We get rid of parentheses
x^2+12x+7x+84-176=0
We add all the numbers together, and all the variables
x^2+19x-92=0
a = 1; b = 19; c = -92;
Δ = b2-4ac
Δ = 192-4·1·(-92)
Δ = 729
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{729}=27$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(19)-27}{2*1}=\frac{-46}{2} =-23 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(19)+27}{2*1}=\frac{8}{2} =4 $
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