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Donald Bates
Mathematics
4 April, 00:06
How do I algebraically solve |4x-3|=5√ (x+4)
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Amare Grimes
4 April, 00:32
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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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