Question 1037093
Subtract
(4x^2+6x-9) from (2x^2-7x+6)
would it be:
-2x^2-13x-15 ?


you are looking at (2x^2 - 7x + 6) - (4x^2 + 6x - 9)


remove the parentheses to get 2x^2 - 7x + 6 - 4x^2 - 6x + 9


combine like terms to get -2x^2 - 13x + 15.


you were close.
looks like you messed up on the subtracting of -9 from 6.
6 - (-9) = 6 + 9 = + 15.

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(5x^3y^7)^3
would it be :
50x^6+y^14 ? 


(5x^3y^7)^3 = (5*x^3*y^7)^3 = 5^3 * (x^3)^3 * (y^7)^3 = 125 * x^(3*3) * (y^(7*3) = 125 * x^9 * y^21.


your solution should be 125x^9y^21.


the basic rules for working with exponents is:


x^a*x^b = x^(a+b)


(x^a)^b = x^(a*b)


(x^a*y^b)^c = (x^a)^c * (y^b)^c = x^(a*c) * y^(b*c)


here's a lesson on working with exponents that might help.


<a href = "http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut2_exp.htm" target = "_blank">http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut2_exp.htm</a>