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4x^2=-1x+7
We move all terms to the left:
4x^2-(-1x+7)=0
We get rid of parentheses
4x^2+1x-7=0
We add all the numbers together, and all the variables
4x^2+x-7=0
a = 4; b = 1; c = -7;
Δ = b2-4ac
Δ = 12-4·4·(-7)
Δ = 113
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{-(1)-\sqrt{113}}{2*4}=\frac{-1-\sqrt{113}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{113}}{2*4}=\frac{-1+\sqrt{113}}{8} $
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