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2x(4x+8)=3
We move all terms to the left:
2x(4x+8)-(3)=0
We multiply parentheses
8x^2+16x-3=0
a = 8; b = 16; c = -3;
Δ = b2-4ac
Δ = 162-4·8·(-3)
Δ = 352
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{352}=\sqrt{16*22}=\sqrt{16}*\sqrt{22}=4\sqrt{22}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-4\sqrt{22}}{2*8}=\frac{-16-4\sqrt{22}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+4\sqrt{22}}{2*8}=\frac{-16+4\sqrt{22}}{16} $
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