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(9x-6)(x+16)=180
We move all terms to the left:
(9x-6)(x+16)-(180)=0
We multiply parentheses ..
(+9x^2+144x-6x-96)-180=0
We get rid of parentheses
9x^2+144x-6x-96-180=0
We add all the numbers together, and all the variables
9x^2+138x-276=0
a = 9; b = 138; c = -276;
Δ = b2-4ac
Δ = 1382-4·9·(-276)
Δ = 28980
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{28980}=\sqrt{36*805}=\sqrt{36}*\sqrt{805}=6\sqrt{805}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(138)-6\sqrt{805}}{2*9}=\frac{-138-6\sqrt{805}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(138)+6\sqrt{805}}{2*9}=\frac{-138+6\sqrt{805}}{18} $
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