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x(2x+7)+4=180
We move all terms to the left:
x(2x+7)+4-(180)=0
We add all the numbers together, and all the variables
x(2x+7)-176=0
We multiply parentheses
2x^2+7x-176=0
a = 2; b = 7; c = -176;
Δ = b2-4ac
Δ = 72-4·2·(-176)
Δ = 1457
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-\sqrt{1457}}{2*2}=\frac{-7-\sqrt{1457}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{1457}}{2*2}=\frac{-7+\sqrt{1457}}{4} $
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