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anonymous

  • 5 years ago

Solve for x in the following equation 5x^2-27x-56=0 A.) x=-7;8/5 B.)x=-7;-8/5 C.)x=7;-8/5 D.)x=7;8/5

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  1. anonymous
    • 5 years ago
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    again, for these sorts of problems, it is faster to substitute the values and see which of them solve it.

  2. anonymous
    • 5 years ago
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    i think its a

  3. anonymous
    • 5 years ago
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    A

  4. anonymous
    • 5 years ago
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    no it cant be. -7 doesnt solve that equation

  5. anonymous
    • 5 years ago
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    so i got D

  6. anonymous
    • 5 years ago
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    see, there is a little trick you can use. With just two substitutions you can determine which is the correct answer. Suppose you substitute 7 in the equation, it solves it. so the answer is either C or D. next substitute 8/5. it doesn't solve the equation. So it is not D. so your answer has to be C

  7. anonymous
    • 5 years ago
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    ohhh i get my sighs messed up thanks

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spraguer (Moderator)
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