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=A2-4A+3
We move all terms to the left:
-(A2-4A+3)=0
We add all the numbers together, and all the variables
-(+A^2-4A+3)=0
We get rid of parentheses
-A^2+4A-3=0
We add all the numbers together, and all the variables
-1A^2+4A-3=0
a = -1; b = 4; c = -3;
Δ = b2-4ac
Δ = 42-4·(-1)·(-3)
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$A_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$A_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{4}=2$$A_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-2}{2*-1}=\frac{-6}{-2} =+3 $$A_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+2}{2*-1}=\frac{-2}{-2} =1 $
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