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4m+2m(m+1)=9m+5
We move all terms to the left:
4m+2m(m+1)-(9m+5)=0
We multiply parentheses
2m^2+4m+2m-(9m+5)=0
We get rid of parentheses
2m^2+4m+2m-9m-5=0
We add all the numbers together, and all the variables
2m^2-3m-5=0
a = 2; b = -3; c = -5;
Δ = b2-4ac
Δ = -32-4·2·(-5)
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{49}=7$$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-7}{2*2}=\frac{-4}{4} =-1 $$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+7}{2*2}=\frac{10}{4} =2+1/2 $
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