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ikoreanx3

  • 3 years ago

Factor. 5x^2+5x-30

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  1. whpalmer4
    • 3 years ago
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    5*-30 = -150. Can you think of two numbers which multiplied give you -150, and added give you 5?

  2. ZeHanz
    • 3 years ago
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    I would first factor out a 5: 5(x²+x-6). Now look for two numbers, with product 6 and sum 1 (because it is 1*x)

  3. ikoreanx3
    • 3 years ago
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    so would it be 5(x )(x ) ?

  4. ZeHanz
    • 3 years ago
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    Yes, and put the numbers that have sum 1 and produc -6 on the blanks...

  5. ikoreanx3
    • 3 years ago
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    Don't you have to find the mutiples of -30. . . that sum to 5

  6. ZeHanz
    • 3 years ago
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    You could also do it that way, but because I have factored out the 5, the other numbers can be smaller, so easier (imo)

  7. ikoreanx3
    • 3 years ago
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    I got confused with your method, I'm sorry.

  8. ZeHanz
    • 3 years ago
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    Can you find the numbers? Their sum is 1, their product = -6, because you have to factor x²+1x-6

  9. ikoreanx3
    • 3 years ago
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    i got 5(x-2)(x+3)

  10. ZeHanz
    • 3 years ago
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    Fine! That's all.

  11. whpalmer4
    • 3 years ago
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    Yes, factoring out the 5 does make it a little easier, and your factoring is correct. Good job!

  12. ikoreanx3
    • 3 years ago
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    Thank you, guys

  13. whpalmer4
    • 3 years ago
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    I like leaving the extra factors in so I get practice for the times when I can't factor them out :-)

  14. whpalmer4
    • 3 years ago
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    Just about everything is easier with practice, so practicing the really hard stuff narrows the gap between easy and hard...

  15. ZeHanz
    • 3 years ago
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    So you like torturing yourself... ;)

  16. whpalmer4
    • 3 years ago
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    In moderation :-)

  17. ZeHanz
    • 3 years ago
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    OK, carry on then!

  18. ikoreanx3
    • 3 years ago
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    o.o lol

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