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carlenstar281

  • 3 years ago

Math question help me!!!

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  1. carlenstar281
    • 3 years ago
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    (x^2-3x+1)- (x^2+2x+7) Answer = -5x-6 How i don't understand this ?

  2. camoJAX
    • 3 years ago
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    distribute the - sign through the (x^2+2x+7) and the x^2's will cancel. then go from there

  3. skullpatrol
    • 3 years ago
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    Do you understand now? @carlenstar281

  4. carlenstar281
    • 3 years ago
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    yes sorta why do I have to distribute the minus sign

  5. skullpatrol
    • 3 years ago
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    Because the opposite of a sum is the sum of the opposites.

  6. skullpatrol
    • 3 years ago
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    $$-(a+b)=(-a)+(-b)$$

  7. carlenstar281
    • 3 years ago
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    oh I got it now thanks :)

  8. skullpatrol
    • 3 years ago
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    And now you can use $$a+b=b+a$$ to move the terms around.

  9. camoJAX
    • 3 years ago
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    think of an imaginary -1 right there where the - sign it. \[(x^2-3x+1) - (x^2+2x+7)\] \[(x^2-3x+1) + (-x^2-2x-7)\]

  10. camoJAX
    • 3 years ago
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    \[x^2+-x^2=0\] they are like terms kinda like 1+-1=0

  11. camoJAX
    • 3 years ago
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    or you dont have to distribute it out either way they will cancel

  12. skullpatrol
    • 3 years ago
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    @camoJAX Please use parentheses :)

  13. camoJAX
    • 3 years ago
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    hahaha gotcha

  14. skullpatrol
    • 3 years ago
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    Thanks

  15. skullpatrol
    • 3 years ago
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    @carlenstar281 Do you want a more detailed explanation?

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