Question

Evaluate. gh - k when g = -6, h = 15, and k = -27

Answer 1

gh - k = (-6)(15) - (-27)
can you do it further???

Answer 2

Um, From this point I would multiply -6 and 15? And then subtract negative 27?

Answer 3

yes exactly

Answer 4

The answer is 63?

Answer 5

yap

Answer 6

I just Googled (-90) - (-27) and the answer is -63. But when I did it on paper I got positive 63. I thought two negatives made a positive when subtracting, what am I doing wrong?

Answer 7

no you got it wrong, you have to put the sign of greater number with the result

Answer 8

Is that an algebraic rule?

Answer 9

yes its a rule

Answer 10

gh - k = (-6)(15) - (-27)
-3[(2 15) - (9)] = 9 [2 (-5) + 3} = -63
I first factor -3 then factor another -3 thereby simplifying calculation