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(4x-1)(2x+3)=7x
We move all terms to the left:
(4x-1)(2x+3)-(7x)=0
We add all the numbers together, and all the variables
-7x+(4x-1)(2x+3)=0
We multiply parentheses ..
(+8x^2+12x-2x-3)-7x=0
We get rid of parentheses
8x^2+12x-2x-7x-3=0
We add all the numbers together, and all the variables
8x^2+3x-3=0
a = 8; b = 3; c = -3;
Δ = b2-4ac
Δ = 32-4·8·(-3)
Δ = 105
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-\sqrt{105}}{2*8}=\frac{-3-\sqrt{105}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{105}}{2*8}=\frac{-3+\sqrt{105}}{16} $
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