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X+X=11X*X=30
We move all terms to the left:
X+X-(11X*X)=0
We add all the numbers together, and all the variables
X+X-(+11X*X)=0
We add all the numbers together, and all the variables
2X-(+11X*X)=0
We get rid of parentheses
2X-11X*X=0
Wy multiply elements
-11X^2+2X=0
a = -11; b = 2; c = 0;
Δ = b2-4ac
Δ = 22-4·(-11)·0
Δ = 4
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{4}=2$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2}{2*-11}=\frac{-4}{-22} =2/11 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2}{2*-11}=\frac{0}{-22} =0 $
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