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X2-5X+18=7X-2
We move all terms to the left:
X2-5X+18-(7X-2)=0
We add all the numbers together, and all the variables
X^2-5X-(7X-2)+18=0
We get rid of parentheses
X^2-5X-7X+2+18=0
We add all the numbers together, and all the variables
X^2-12X+20=0
a = 1; b = -12; c = +20;
Δ = b2-4ac
Δ = -122-4·1·20
Δ = 64
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{64}=8$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-8}{2*1}=\frac{4}{2} =2 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+8}{2*1}=\frac{20}{2} =10 $
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