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7x+2x^2=10
We move all terms to the left:
7x+2x^2-(10)=0
a = 2; b = 7; c = -10;
Δ = b2-4ac
Δ = 72-4·2·(-10)
Δ = 129
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{-(7)-\sqrt{129}}{2*2}=\frac{-7-\sqrt{129}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{129}}{2*2}=\frac{-7+\sqrt{129}}{4} $
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