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(3x+5)(-1/2x+16)=0
Domain of the equation: 2x+16)!=0We multiply parentheses ..
x∈R
(-3x^2+48x-5x+80)=0
We get rid of parentheses
-3x^2+48x-5x+80=0
We add all the numbers together, and all the variables
-3x^2+43x+80=0
a = -3; b = 43; c = +80;
Δ = b2-4ac
Δ = 432-4·(-3)·80
Δ = 2809
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2809}=53$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(43)-53}{2*-3}=\frac{-96}{-6} =+16 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(43)+53}{2*-3}=\frac{10}{-6} =-1+2/3 $
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