Can you walk me through it stepbystep?
2007-09-24 10:43:31 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
id do my own homework if i understood it!MEANIEPANTS
2007-09-24 10:51:28 · update #1
use distributive property
8a + 4 - 9a + 2 + 3a - 4ab - 2 - 4a
combine like terms
(-4ab) + (8a - 9a + 3a - 4a) + (4 + 2 - 2)
evaluate/solve
-4ab - 2a + 4
2007-09-24 10:49:13 · answer #1 · answered by JQD 2 · 2⤊ 3⤋
Multiply a and 8
Multiply a and 1
The a just gets copied along.
The answer is a
a
8*a evaluates to 8a
8*a+4 evaluates to 8a+4
Multiply a and 9
Multiply a and 1
The a just gets copied along.
The answer is a
a
9*a evaluates to 9a
9*a-2 evaluates to 9a-2
To subtract the polynomials 8a+4 and 9a-2 we try to subtract terms in one polynomialwith any like terms in the other polynomial.
Be very careful with the "-" sign in front of 9a-2 it is to be used on all terms in it.
8a - 9a = -a
4 - -2 = 6
The answer is -a+6
(8*a+4)-(9*a-2) evaluates to -a+6
Multiply a and 3
Multiply a and 1
The a just gets copied along.
The answer is a
a
3*a evaluates to 3a
Multiply a and 4
Multiply a and 1
The a just gets copied along.
The answer is a
a
4*a evaluates to 4a
Multiply b and 4a
Multiply the b and a
Multiply b and a
The b just gets copied along.
The a just gets copied along.
The answer is ba
ba
4*a*b evaluates to 4ba
3*a-4*a*b evaluates to 3a-4ba
The answer is 3a-4ba-2
3*a-4*a*b-2 evaluates to 3a-4ba-2
To add the polynomials -a+6 and 3a-4ba-2 we try to add or combine terms in one polynomialwith any like terms in the other polynomial.
-a + 3a = 2a
6 + -2 = 4
The answer is 2a+4-4ba
(8*a+4)-(9*a-2)+(3*a-4*a*b-2) evaluates to 2a+4-4ba
Multiply a and 4
Multiply a and 1
The a just gets copied along.
The answer is a
a
4*a evaluates to 4a
2a - 4a = -2a
The answer is -2a+4-4ba
(8*a+4)-(9*a-2)+(3*a-4*a*b-2)-4*a evaluates to -2a+4-4ba
you did say step by step :p
hope this helpz :D
2007-09-24 10:53:55 · answer #2 · answered by Herp-da-Derp 5 · 0⤊ 2⤋
(8a + 4) - (9a -2) + (3a - 4ab - 2) - 4a
1) disregard the brackets but keep in mind -(9a-2) means -9a- -2 which is -9a+2
8a +4 - 9a +2 + 3a - 4ab - 2 - 4a
2) put like terms together:
(8a - 9a + 3a - 4a) + (4 + 2 - 2)-4ab
-2a + 4 - 4ab
3) Common mistakes are:
- you do not extend the negative sign to all terms within brackets i.e -(9a-2) IS NOT -9a-2 BUT -9a + 2
-A product of unknown terms cannot be associated with either single terms i.e -4ab is not like -4a
2007-09-24 10:55:38 · answer #3 · answered by ndini 2 · 0⤊ 1⤋
= (4a^3 – 2a^2 – 3a) – (a^3 + 5a^2 + 9a) = 4a^3 – 2a^2 – 3a – a^3 – 5a^2 – 9a = 3a^3 – 7a^2 – 12a ————> closest answer is (a) = a(3a^2 – 7a – 12) ... answer: not one of the above.
2016-11-06 06:50:43 · answer #4 · answered by ? 4 · 0⤊ 0⤋
(8a+4) - (9a-2) + (3a-4ab-2) - 4a --->distribute now
8a+4-9a+2+3a-4ab-2-4a --->combine like terms next
-2a+4-4ab --->that's the answer!
2007-09-24 10:51:04 · answer #5 · answered by Vanessa 4 · 1⤊ 1⤋
(8a + 4) - (9a -2) + (3a - 4ab - 2) - 4a
=8a + 4- 9a +2 + 3a - 4ab - 2 - 4a
=8a - 9a + 3a - 4a- 4ab + 4+2 - 2
=-2a-4ab+4
2007-09-24 10:51:17 · answer #6 · answered by Hang 3 · 0⤊ 3⤋
(8a+4) + -(9a-2) + (3a-4ab-2) -4a
distribute the "-"
8a + 4 - 9a + 2 + 3a - 4ab - 2 - 4a
combine a's...
8a - 9a + 3a - 4a = -2a
combine numbers
4+2-2=4
so....
-2a -4ab+4
2007-09-24 10:49:56 · answer #7 · answered by ladyluck 5 · 2⤊ 3⤋
(8a + 4) - (9a -2) + (3a - 4ab - 2) - 4a
=8a+4-9a+2+3a-4ab-2-4a
= -2a +4-4ab
= -2(a-2+2ab)
2007-09-24 10:51:02 · answer #8 · answered by ironduke8159 7 · 0⤊ 3⤋