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anonymous

  • 5 years ago

z2 – z – 56 how to factor completely this problem?

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  1. anonymous
    • 5 years ago
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    (z - 8)(z + 7)

  2. anonymous
    • 5 years ago
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    Which gives you z = 8 and z = -7 as your roots.

  3. anonymous
    • 5 years ago
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    I get the opposite (z-7)(z+8) are they the same?

  4. anonymous
    • 5 years ago
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    no they are not the same. FOIL your answer you would get z^2 + z - 56

  5. anonymous
    • 5 years ago
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    you want two numbers that multiply to -56 and add up to -1 -8 and 7 will do that 8 and -7 will get you a sum of +1 HOWEVER, the ROOTS of the equation, as BubbaMurphy says are 8 and -7 because you have (z - 8)(z + 7) = 0 so you get z - 8 = 0 z + 7 = 0 giving you z = 8 and -7

  6. anonymous
    • 5 years ago
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    oh okey thanks guys u save me

  7. anonymous
    • 5 years ago
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    No problem

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