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4(-1/2x+7)x=15
We move all terms to the left:
4(-1/2x+7)x-(15)=0
Domain of the equation: 2x+7)x!=0We multiply parentheses
x∈R
-4x^2+28x-15=0
a = -4; b = 28; c = -15;
Δ = b2-4ac
Δ = 282-4·(-4)·(-15)
Δ = 544
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{544}=\sqrt{16*34}=\sqrt{16}*\sqrt{34}=4\sqrt{34}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(28)-4\sqrt{34}}{2*-4}=\frac{-28-4\sqrt{34}}{-8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(28)+4\sqrt{34}}{2*-4}=\frac{-28+4\sqrt{34}}{-8} $
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