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5a(a+2)=a(6+2a)+10a
We move all terms to the left:
5a(a+2)-(a(6+2a)+10a)=0
We add all the numbers together, and all the variables
5a(a+2)-(a(2a+6)+10a)=0
We multiply parentheses
5a^2+10a-(a(2a+6)+10a)=0
We calculate terms in parentheses: -(a(2a+6)+10a), so:We get rid of parentheses
a(2a+6)+10a
We add all the numbers together, and all the variables
10a+a(2a+6)
We multiply parentheses
2a^2+10a+6a
We add all the numbers together, and all the variables
2a^2+16a
Back to the equation:
-(2a^2+16a)
5a^2-2a^2+10a-16a=0
We add all the numbers together, and all the variables
3a^2-6a=0
a = 3; b = -6; c = 0;
Δ = b2-4ac
Δ = -62-4·3·0
Δ = 36
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{36}=6$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-6}{2*3}=\frac{0}{6} =0 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+6}{2*3}=\frac{12}{6} =2 $
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