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-5x(3x+4)=-29+8x
We move all terms to the left:
-5x(3x+4)-(-29+8x)=0
We add all the numbers together, and all the variables
-5x(3x+4)-(8x-29)=0
We multiply parentheses
-15x^2-20x-(8x-29)=0
We get rid of parentheses
-15x^2-20x-8x+29=0
We add all the numbers together, and all the variables
-15x^2-28x+29=0
a = -15; b = -28; c = +29;
Δ = b2-4ac
Δ = -282-4·(-15)·29
Δ = 2524
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2524}=\sqrt{4*631}=\sqrt{4}*\sqrt{631}=2\sqrt{631}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-28)-2\sqrt{631}}{2*-15}=\frac{28-2\sqrt{631}}{-30} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-28)+2\sqrt{631}}{2*-15}=\frac{28+2\sqrt{631}}{-30} $
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