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(7/9)y+5=8
We move all terms to the left:
(7/9)y+5-(8)=0
Domain of the equation: 9)y!=0We add all the numbers together, and all the variables
y!=0/1
y!=0
y∈R
(+7/9)y+5-8=0
We add all the numbers together, and all the variables
(+7/9)y-3=0
We multiply parentheses
7y^2-3=0
a = 7; b = 0; c = -3;
Δ = b2-4ac
Δ = 02-4·7·(-3)
Δ = 84
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}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{84}=\sqrt{4*21}=\sqrt{4}*\sqrt{21}=2\sqrt{21}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{21}}{2*7}=\frac{0-2\sqrt{21}}{14} =-\frac{2\sqrt{21}}{14} =-\frac{\sqrt{21}}{7} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{21}}{2*7}=\frac{0+2\sqrt{21}}{14} =\frac{2\sqrt{21}}{14} =\frac{\sqrt{21}}{7} $
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