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anonymous

  • 5 years ago

Simplify (5x+10)(5x-10)

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  1. anonymous
    • 5 years ago
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    FOIL

  2. anonymous
    • 5 years ago
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    so...answer would be 5(x^2-4)?

  3. dumbcow
    • 5 years ago
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    factor out a 5 5(x+2)(x-2)

  4. anonymous
    • 5 years ago
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    This is simple, you can solve by using the identity: (a + b) (a-b) = a^2 - b^2 so it is (5x)^2 - (10)^2 = 25x^2 - 100

  5. dumbcow
    • 5 years ago
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    ooops yeah i meant 25(x-2)(x+2)

  6. anonymous
    • 5 years ago
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    which reduces to 5(x^2-4)?

  7. anonymous
    • 5 years ago
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    Then you can take out common factor 25 to get final answer 25 (x^2 - 4)

  8. anonymous
    • 5 years ago
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    @kaynkay Go thru my answer. It is step-by-step logic and clear

  9. anonymous
    • 5 years ago
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    oops - I see, have to leave the 25, since the 100 is the factor - so answer would be: 25(x^2-4)...got it, thank you!

  10. anonymous
    • 5 years ago
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    Good ! However, if you hv to show factors, then dumbcow's answer is right.

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