reedplymel
  • reedplymel
Find the difference: (6y3 + 17y − 3) − (4y3 − 11y + 9) 2y3 + 28y + 12 2y3 + 6y − 12 2y3 + 28y − 6 2y3 + 28y − 12
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=%286y3+%2B+17y+%E2%88%92+3%29+%E2%88%92+%284y3+%E2%88%92+11y+%2B+9%29
welshfella
  • welshfella
first distribute the negative over the second parentheses
anonymous
  • anonymous
D

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reedplymel
  • reedplymel
the last one??
anonymous
  • anonymous
Yes its the last one
reedplymel
  • reedplymel
ok medal goes to u thx
anonymous
  • anonymous
yay thank you
reedplymel
  • reedplymel
Find the sum: (3x2 + 5x − 8) + (5x2 − 13x − 5) 8x2 + 8x − 13 8x2 − 8x + 13 8x2 − 8x − 13 8x2 − x − 13
reedplymel
  • reedplymel
this one
anonymous
  • anonymous
c
reedplymel
  • reedplymel
ok can u work with me on the rest so i can know tjis stuff instead of u giving it to mee Simplify the expression (2x − 9)(x + 6). 2x2 − 54 2x2 − 3x − 54 2x2 + 3x − 54 2x2 + 21x − 54
welshfella
  • welshfella
@beckyg111 Please dont just give the answer - guide the questioner through the problem
reedplymel
  • reedplymel
ya im tryin to learn can u help me
anonymous
  • anonymous
Ok sorry @welshfella can u help him i need to take a test
welshfella
  • welshfella
(2x − 9)(x + 6) first you multiply the second part by 2x then multiply it by -9 = 2x(x + 6) - 9(x + 6) ok so far?
reedplymel
  • reedplymel
yeah
welshfella
  • welshfella
right- now you distribute the 2x and the -9 over the 2 parentheses = 2x*x + 2x*6 - 9*x -9*6 = 2x^2 + 12x - 9x - 54 notice the last term is negative 54 because you multiply negative times positive
reedplymel
  • reedplymel
so A is out?
welshfella
  • welshfella
now the 2 middle terms are alike so it simplifies to 2x^2 + 3x - 54
welshfella
  • welshfella
yes its not A
reedplymel
  • reedplymel
ok were did u get the 3x
welshfella
  • welshfella
12x - 9x = 3x
welshfella
  • welshfella
- combining like terms
reedplymel
  • reedplymel
theres only one x plus the 2x aint no 12
welshfella
  • welshfella
2x^2 + 12x - 9x - 54 = 2x^2 + 3x - 54 the 2 middle terms are 12x and - 9x - they are like termsa so you can simplify them
reedplymel
  • reedplymel
ohh so its C?
welshfella
  • welshfella
yes
reedplymel
  • reedplymel
mb computer messin up
reedplymel
  • reedplymel
thx
welshfella
  • welshfella
yw
reedplymel
  • reedplymel
do u think u can do some more wit me
welshfella
  • welshfella
i can probably do one more I have to go soon.
reedplymel
  • reedplymel
ya me too Simplify the expression -2x2(4x − 3).
reedplymel
  • reedplymel
8x3 − 6x2 -8x3 + 6x2 8x3 − 6x2 8x3 + 6x2
welshfella
  • welshfella
= -2x^2 * 4x - 2x^2 * -3
welshfella
  • welshfella
-2 * 4 = ?
welshfella
  • welshfella
remember negative * positive = negative

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