ln(4x)=13
4x=e^13
x=(e^13)/4
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4x+13 = 21 4x = 21-13 4x = 8 x = 2
The answer to the problem of 13 equals -4x plus 9 is x equals -1.
13
8x+5=4x+13 4x=8 x=2 Therefore, your answer is 2.
x2 - 4x - 9 = 0 ∴ x2 - 4x = 9 ∴ x2 - 4x + 4 = 13 ∴ (x - 2)2 = 13 ∴ x - 2 = ±√13 ∴ x = 2 ± √13