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28 August, 07:26

How do I algebraically solve |4x-3|=5√ (x+4)

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  1. 28 August, 09:12
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    Step-by-step explanation:

    |4x-3|=5√ (x+4) ⇔ |4x-3|²=5² (√ (x+4)) ² and x+4 ≥ 0

    ⇔ (4x-3) ² = 25 (x+4) and x+4 ≥ 0 (because : / a/² = a²)

    ⇔16x²-24x+9 = 25x + 100 and x+4 ≥ 0

    ⇔ 16x² - 49x - 91 = 0 and x+4 ≥ 0 quadratic equation

    Δ = (-49) ²-4 (16) (-91) = 8225

    two solution : X1 = (49-√8225) / 32 ≅ - 1.3 accept (-1.3+4 ≥ 0)

    X2 = (49+√8225) / 32 ≅4.37 accept (4.37+4 ≥ 0)
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