# Math

posted by .

Reiny can you show me how to check this problem.
5a^8-20a^7-25a^6

=5a^6(a^2-4a-5)

=5a^6(a^2-5a+a-5)

=5a^6(a(a-5)+1(a-5)

• Math -

The GCF is always = to 0r less than the smallest coefficient:

GCF =< 5.

When a variable is involved, choose the
common variable of lowest degree(smallest exponent). All of this has been properly done.

Perform the multiplication; the product
should be identical to the expression
that was given.

5a^6(a-5)(a+1) =
(5a^7-25a^6)(a+1) =
5a^8 + 5a^7 - 25a^7 -25a^6 =
Combine like-terms:
5a^8 - 20a^7 - 25a^6.

## Similar Questions

1. ### 7th grade-Algebra Worth Problem

Please show equation and solve for the following 1. Lyn's age is 8 years less than 15 times the age of her niece Elizabeth. If the sum of their ages is 24, what is Elizabeth's age ( Let e= Elizabeth's age) 2. Bob is renting a canoe …
2. ### reiny

How do I find a variance for a set of numbers {1,16,8,17,12} I got that variance-34.2, but I'm unsure. Any help?
3. ### algebra last post

I appreciate the help. i take the class online and we get 70 problems a day to do. sqrt = < sign #46. <-r^5/2 * <-2/r^3 #50 <-25a^3 - <-225a^3 + 20a<-a
4. ### Algebra-Can you please check this Reiny

Can you check this: x^-3y^2/x^2y^-4 I think the answer is y^6/x^5 Thanks for explaining the other problem
5. ### Reiny

Reiny I think I have found out the rectangle problem. Could you check and see if Ive got it correct?
6. ### pre calc

factor ((5a^2+12a+4)/(a^4-16)) / ((25a^2+20a+4)/(a^2-2a))
7. ### To Reiny

Reiny could you please check my Calculus post below, it says Calculus--Reiny.
8. ### Algebra

Hi! I just want you to check if my answers are correct. Factor the expressions: 1. 15a^2(b-2)^2 + 20a^3(b-2)^3 = my answer is 5a^2(b-2)^2 [3 + 4a(b-2)] 2. 18p^2q^3 (r-6)+ 24(r-6) = my answer is 6(r-6)[3p^2q^3 + 4] 3. 24(x-y)^2 + 48(y-x) …
9. ### Reiny or Steve could you check my Math?

1. (9m+6)+(-5m-6) my answer: 4m 2. (3r^2+7r+1)+(4r^2-8r-2) my answer: 7r^2-r-1 3. (6h-1)-(9h+4) my answer: -3h-3 4. (m^2-m-4)+(m-5) my answer: m^2-9 5. (4x+4)+(3x+2+1) my answer: 7x+7 Now this was book work for me so it doesn't have …
10. ### Reiny and steve do this for me please

1. Consider the functions f(x)=1/(x)+4 and g(x)=2/(x). Graph f and g on the same grid. a) Determine the points of intersection of the two functions. b) Show where f(x)<g(x). c) Solve the equation 1/(x)+4=2(x) to check your answer …

More Similar Questions