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Tati_Lee

  • 3 years ago

please help! Explain, in complete sentences, how you would factor 27x4 – 90x2 + 75. Provide the factors

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  1. cwrw238
    • 3 years ago
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    notice that 27, 90 and 75 are all divisible by 3 so we can write 3(9x^4 - 30x^2 + 25) now you can try to factor whats in parentheses

  2. cwrw238
    • 3 years ago
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    we must now look for 4 numbers which are factors of 9 and 25 which give us a product of 25 and when multiplied and added give us the middle number -30 to give factors of the form (ax^2 + b)(cx^2 + d)

  3. Tati_Lee
    • 3 years ago
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    3(3x^2-5)(3x^2-5)

  4. Tati_Lee
    • 3 years ago
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    is that right?

  5. cwrw238
    • 3 years ago
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    I do this by trial and error - yeah - thats right - why are you asking?!!

  6. Tati_Lee
    • 3 years ago
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    sorry i was just making sure o.O

  7. eyust707
    • 3 years ago
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    great job!

  8. cwrw238
    • 3 years ago
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    thats ok - thats as far as you can go 3x^ -5 won't factor

  9. Tati_Lee
    • 3 years ago
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    thank you eyust & ohhh okay thanks & you're a little fiesty lolol

  10. Tati_Lee
    • 3 years ago
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    eyust you never answer my last question on the other problem

  11. cwrw238
    • 3 years ago
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    yeah - good luck

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