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(w-8)(w+9)=72
We move all terms to the left:
(w-8)(w+9)-(72)=0
We multiply parentheses ..
(+w^2+9w-8w-72)-72=0
We get rid of parentheses
w^2+9w-8w-72-72=0
We add all the numbers together, and all the variables
w^2+w-144=0
a = 1; b = 1; c = -144;
Δ = b2-4ac
Δ = 12-4·1·(-144)
Δ = 577
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{577}}{2*1}=\frac{-1-\sqrt{577}}{2} $$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{577}}{2*1}=\frac{-1+\sqrt{577}}{2} $
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