anonymous
  • anonymous
Math question help me!!!
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
(x^2-3x+1)- (x^2+2x+7) Answer = -5x-6 How i don't understand this ?
anonymous
  • anonymous
distribute the - sign through the (x^2+2x+7) and the x^2's will cancel. then go from there
skullpatrol
  • skullpatrol
Do you understand now? @carlenstar281

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anonymous
  • anonymous
yes sorta why do I have to distribute the minus sign
skullpatrol
  • skullpatrol
Because the opposite of a sum is the sum of the opposites.
skullpatrol
  • skullpatrol
$$-(a+b)=(-a)+(-b)$$
anonymous
  • anonymous
oh I got it now thanks :)
skullpatrol
  • skullpatrol
And now you can use $$a+b=b+a$$ to move the terms around.
anonymous
  • anonymous
think of an imaginary -1 right there where the - sign it. \[(x^2-3x+1) - (x^2+2x+7)\] \[(x^2-3x+1) + (-x^2-2x-7)\]
anonymous
  • anonymous
\[x^2+-x^2=0\] they are like terms kinda like 1+-1=0
anonymous
  • anonymous
or you dont have to distribute it out either way they will cancel
skullpatrol
  • skullpatrol
@camoJAX Please use parentheses :)
anonymous
  • anonymous
hahaha gotcha
skullpatrol
  • skullpatrol
Thanks
skullpatrol
  • skullpatrol
@carlenstar281 Do you want a more detailed explanation?

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