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mckayla_04

  • 2 years ago

olve 4x2 = 12x + 40.

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  1. bahrom7893
    • 2 years ago
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    Try this one yourself, come on!

  2. mckayla_04
    • 2 years ago
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    solve 4^2

  3. bahrom7893
    • 2 years ago
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    first step should be moving everything over to one side and dividing everything by 4

  4. mckayla_04
    • 2 years ago
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    Thats the Point, I dont know how.

  5. bahrom7893
    • 2 years ago
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    Ok, i'll show u this ex. Try the next one: 4x^2 = 12x + 40 4x^2 - 12x - 40 = 0

  6. bahrom7893
    • 2 years ago
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    now divide everything by 4: x^2 - 3x - 10 = 0

  7. bahrom7893
    • 2 years ago
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    Now use the discriminant formula: D = (-3)^2 - 4*(1)*(-10) = 9 + 40 = 49

  8. bahrom7893
    • 2 years ago
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    x1 = (-b - sqrt(D))/(2a) x2 = (-b +sqrt(D))/(2a)

  9. bahrom7893
    • 2 years ago
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    x1 = (3 - 7)/2 = -2 x2 = (3+7)/2 = 5

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