Question

Evaluate: 3t(t+2)-3t^2 for t=19 . Lost.

Answer 1

3t*t+3t*2-3t^2=3t^2+6t-3t^2=6t
can you continue??

Answer 2

I substituted 19 into t. Which came out like this:
3(19) (19+2)-3(19)^2

Answer 3

I'm pretty confused from there. I know distributed property must take place but when?

Answer 4

Well my book is telling me it's 114, but I want to know how to actually solve it. I live Florida so I have exams coming up next week.

Answer 5

Now just collapse the parentheses:

\[3(19)(19+2)-3(19)^2 = 3(19)(21)-3(19)^2 = 3*19*21-3*19*19\]
Be sure you do all the multiplications before the subtraction!

Easier, though, would be to look at what marsss wrote and observe that you only have to evaluate 6t = 6(19) :-)

Answer 6

Thanks men.

Answer 7

welcome :)

Answer 8

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Answer 9

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Answer 10

Really ? Sweet dude