anonymous
  • anonymous
5x(x^2+7x-4)
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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amistre64
  • amistre64
do you know what distributing is?
anonymous
  • anonymous
no
amistre64
  • amistre64
then lets do a simple example: we know that 3(8) = 24 right?

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anonymous
  • anonymous
yeaa
amistre64
  • amistre64
then: 3(6+2) should equal 24 also right?
anonymous
  • anonymous
yes
amistre64
  • amistre64
good: what we are going to do then is "distribute" the 3 thru the (6+2) like this: 3(6) + 3(2) = 24 18 + 6 = 24 24 = 24. did you see what I did?
anonymous
  • anonymous
yes i understand that but i dont understand it when it has exponets and letters
amistre64
  • amistre64
fair enough..... those are simple rules as well..but lets use your problem: 5x(x^2+7x-4) 5x(x^2) + 5x(7x) + 5x(-4) 5xxx + 35xx + -20x 5x^3 + 35x^2 - 20x did you see what happened? with the x's?
amistre64
  • amistre64
x^2 means you have 2 little x's x^2 = xx x^5 = xxxxx x^9 = xxxxxxxxx
amistre64
  • amistre64
when we multiply "letters" we just tack on another one: xx time xxx = xxxxx x^2 times x^3 = x^5
anonymous
  • anonymous
okk
amistre64
  • amistre64
easy as ....pi :)
anonymous
  • anonymous
can you help me with a dividing one?
amistre64
  • amistre64
i can try...
anonymous
  • anonymous
5x3 +10x2 +20x/5x
amistre64
  • amistre64
is that 5x on the end the denominator for ALL of them? or just for the last one?
anonymous
  • anonymous
for all
amistre64
  • amistre64
ok.... for this we need to remember that anything over itself can be "canceled" out..... actually it turns to 1. lets do the first term: 5xxx ----- anything that is the same can be canceled 5x take off a 5x from top and bottom to get: [5x]xx xx = x^2 does that makes sense? ------ = [5x]
anonymous
  • anonymous
yes
amistre64
  • amistre64
2nd term: 10xx ----- what can we do to this one? 5x
anonymous
  • anonymous
is it gunna be 2x?
amistre64
  • amistre64
very good :)
amistre64
  • amistre64
and the last one? 20x ------ 5x
anonymous
  • anonymous
4x?
amistre64
  • amistre64
4 is right, but we can cancel out an x from top and an x from bottom, so the answer becomes just: 4 do you see that?
anonymous
  • anonymous
yea i wasnt sure but i see it now
amistre64
  • amistre64
good job :) with practice youlll be better than me :)
anonymous
  • anonymous
haha thank you

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