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(2/3)y-(1/6)y+4=19
We move all terms to the left:
(2/3)y-(1/6)y+4-(19)=0
Domain of the equation: 3)y!=0
y!=0/1
y!=0
y∈R
Domain of the equation: 6)y!=0We add all the numbers together, and all the variables
y!=0/1
y!=0
y∈R
(+2/3)y-(+1/6)y+4-19=0
We add all the numbers together, and all the variables
(+2/3)y-(+1/6)y-15=0
We multiply parentheses
2y^2-y^2-15=0
We add all the numbers together, and all the variables
y^2-15=0
a = 1; b = 0; c = -15;
Δ = b2-4ac
Δ = 02-4·1·(-15)
Δ = 60
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}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{60}=\sqrt{4*15}=\sqrt{4}*\sqrt{15}=2\sqrt{15}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{15}}{2*1}=\frac{0-2\sqrt{15}}{2} =-\frac{2\sqrt{15}}{2} =-\sqrt{15} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{15}}{2*1}=\frac{0+2\sqrt{15}}{2} =\frac{2\sqrt{15}}{2} =\sqrt{15} $
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