Tn=n2+2n
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Answer:
T=T2+2T+9
We move all terms to the left:
T-(T2+2T+9)=0
We add all the numbers together, and all the variables
-(+T^2+2T+9)+T=0
We get rid of parentheses
-T^2-2T+T-9=0
We add all the numbers together, and all the variables
-1T^2-1T-9=0
a = -1; b = -1; c = -9;
Δ = b2-4ac
Δ = -12-4·(-1)·(-9)
Δ = -35
Delta is less than zero, so there is no solution for the equation
Step-by-step explanation:
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