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anonymous

  • 5 years ago

why is it 4 and not -4 ? (attached)

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  1. anonymous
    • 5 years ago
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  2. myininaya
    • 5 years ago
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    c=4 because x^2-9=8x-25 when x=4

  3. anonymous
    • 5 years ago
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    If x was -4, you would have x^2 - 9 = 16-9 = 5 But 8x-25 = 8(-4) - 25 = 57 So they aren't equal at that point.

  4. anonymous
    • 5 years ago
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    \[c^{2}-9 = 8c -25\]\[c^{2} - 8c +16 = (c-4)^{2}\] sorry.. forgot i have to invert the root that i find in the parethesis

  5. anonymous
    • 5 years ago
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    Err 16-9 =7

  6. myininaya
    • 5 years ago
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    c^2-9-8c+25=0 c^2-8c+16=0 (c-4)^2=0 oh thats what you have nvm

  7. anonymous
    • 5 years ago
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    yup but thanks hehe

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