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X(30X/100)=1500
We move all terms to the left:
X(30X/100)-(1500)=0
We add all the numbers together, and all the variables
X(+30X/100)-1500=0
We multiply parentheses
30X^2-1500=0
a = 30; b = 0; c = -1500;
Δ = b2-4ac
Δ = 02-4·30·(-1500)
Δ = 180000
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{180000}=\sqrt{90000*2}=\sqrt{90000}*\sqrt{2}=300\sqrt{2}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-300\sqrt{2}}{2*30}=\frac{0-300\sqrt{2}}{60} =-\frac{300\sqrt{2}}{60} =-5\sqrt{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+300\sqrt{2}}{2*30}=\frac{0+300\sqrt{2}}{60} =\frac{300\sqrt{2}}{60} =5\sqrt{2} $
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