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5/2y-y=y+5
We move all terms to the left:
5/2y-y-(y+5)=0
Domain of the equation: 2y!=0We add all the numbers together, and all the variables
y!=0/2
y!=0
y∈R
-1y+5/2y-(y+5)=0
We get rid of parentheses
-1y+5/2y-y-5=0
We multiply all the terms by the denominator
-1y*2y-y*2y-5*2y+5=0
Wy multiply elements
-2y^2-2y^2-10y+5=0
We add all the numbers together, and all the variables
-4y^2-10y+5=0
a = -4; b = -10; c = +5;
Δ = b2-4ac
Δ = -102-4·(-4)·5
Δ = 180
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{180}=\sqrt{36*5}=\sqrt{36}*\sqrt{5}=6\sqrt{5}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-6\sqrt{5}}{2*-4}=\frac{10-6\sqrt{5}}{-8} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+6\sqrt{5}}{2*-4}=\frac{10+6\sqrt{5}}{-8} $
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