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Algebra

Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth.
x² – 21 = –4x
• 7, 3
• –7, 3
• 7, –3
• –7, –3

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  1. put it into standard form of a quadratic ...

    x^2 + 4x - 21 = 0
    how nice that it factors ....

    (x+7)(x-3) = 0

    so x = ... or x = ....

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  2. But you wanted to use the formula ...

    x = (-4 ± √100)/2
    = (-4 ± 10)/2
    = (-4+10)/2 or (-4-10)/2
    = .....

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  3. h^2-2h-2=0

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  4. it’s -7,3

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