Question on: JAMB Mathematics - 2015
Solve the equation
\( 5^{(x − 2)} = (1 ÷ 125)^{(x +3)}\)
\( 5^{(x − 2)} = (1 ÷ 125)^{(x +3)}\)
A
3/2
B
− 7/4
C
4/7
D
7/4
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Correct Option: B
\( 5^{(x − 2)} = (125^{−1} )^{(x + 3)}\\
5^{(x − 2)} = (5− 3)^{x + 3}\\
5^{(x − 2)} = 5^{− 3x − 9}\\
x + 3x = − 9 + 2\\
4x = − 7\\
x = \frac{−7}{4} \)
5^{(x − 2)} = (5− 3)^{x + 3}\\
5^{(x − 2)} = 5^{− 3x − 9}\\
x + 3x = − 9 + 2\\
4x = − 7\\
x = \frac{−7}{4} \)
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