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150=-5(-5-3p)10p
We move all terms to the left:
150-(-5(-5-3p)10p)=0
We add all the numbers together, and all the variables
-(-5(-3p-5)10p)+150=0
We calculate terms in parentheses: -(-5(-3p-5)10p), so:We get rid of parentheses
-5(-3p-5)10p
We multiply parentheses
150p^2+250p
Back to the equation:
-(150p^2+250p)
-150p^2-250p+150=0
a = -150; b = -250; c = +150;
Δ = b2-4ac
Δ = -2502-4·(-150)·150
Δ = 152500
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{152500}=\sqrt{2500*61}=\sqrt{2500}*\sqrt{61}=50\sqrt{61}$$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-250)-50\sqrt{61}}{2*-150}=\frac{250-50\sqrt{61}}{-300} $$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-250)+50\sqrt{61}}{2*-150}=\frac{250+50\sqrt{61}}{-300} $
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