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ikoreanx3

Factor. 5x^2+5x-30

  • one year ago
  • one year ago

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

    • one year ago
  2. ZeHanz
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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)

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

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

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

    • one year ago
  6. ZeHanz
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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)

    • one year ago
  7. ikoreanx3
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    I got confused with your method, I'm sorry.

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

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

    • one year ago
  10. ZeHanz
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    Fine! That's all.

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

    • one year ago
  12. ikoreanx3
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    Thank you, guys

    • one year ago
  13. whpalmer4
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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 :-)

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

    • one year ago
  15. ZeHanz
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    So you like torturing yourself... ;)

    • one year ago
  16. whpalmer4
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    In moderation :-)

    • one year ago
  17. ZeHanz
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    OK, carry on then!

    • one year ago
  18. ikoreanx3
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    o.o lol

    • one year ago
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