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(4x+5)*2x=2x+11
We move all terms to the left:
(4x+5)*2x-(2x+11)=0
We multiply parentheses
8x^2+10x-(2x+11)=0
We get rid of parentheses
8x^2+10x-2x-11=0
We add all the numbers together, and all the variables
8x^2+8x-11=0
a = 8; b = 8; c = -11;
Δ = b2-4ac
Δ = 82-4·8·(-11)
Δ = 416
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{416}=\sqrt{16*26}=\sqrt{16}*\sqrt{26}=4\sqrt{26}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-4\sqrt{26}}{2*8}=\frac{-8-4\sqrt{26}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+4\sqrt{26}}{2*8}=\frac{-8+4\sqrt{26}}{16} $
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