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3g(g-7)=2(10+g)
We move all terms to the left:
3g(g-7)-(2(10+g))=0
We add all the numbers together, and all the variables
3g(g-7)-(2(g+10))=0
We multiply parentheses
3g^2-21g-(2(g+10))=0
We calculate terms in parentheses: -(2(g+10)), so:We get rid of parentheses
2(g+10)
We multiply parentheses
2g+20
Back to the equation:
-(2g+20)
3g^2-21g-2g-20=0
We add all the numbers together, and all the variables
3g^2-23g-20=0
a = 3; b = -23; c = -20;
Δ = b2-4ac
Δ = -232-4·3·(-20)
Δ = 769
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$g_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$g_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$g_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-23)-\sqrt{769}}{2*3}=\frac{23-\sqrt{769}}{6} $$g_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-23)+\sqrt{769}}{2*3}=\frac{23+\sqrt{769}}{6} $
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