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4x^2+7x=2x+1
We move all terms to the left:
4x^2+7x-(2x+1)=0
We get rid of parentheses
4x^2+7x-2x-1=0
We add all the numbers together, and all the variables
4x^2+5x-1=0
a = 4; b = 5; c = -1;
Δ = b2-4ac
Δ = 52-4·4·(-1)
Δ = 41
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{-(5)-\sqrt{41}}{2*4}=\frac{-5-\sqrt{41}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{41}}{2*4}=\frac{-5+\sqrt{41}}{8} $
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