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24 Feb 2022, 02:30
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What is the value of b ?
(1) \(b^4 = 16\)
(2) \(7^{(3b − 4)} = 49\)
(1) \(b^4 = 16\)
(2) \(7^{(3b − 4)} = 49\)
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24 Feb 2022, 04:49
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(1) \(b^4=16\) means \(b\) can be \(±2\). Insufficient.
(2) \(7^{3b-4}=7^2\) means \(3b-4=2\) or \(3b=6\) or \(b=2\). Sufficient.
Hence, B.
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(2) \(7^{3b-4}=7^2\) means \(3b-4=2\) or \(3b=6\) or \(b=2\). Sufficient.
Hence, B.
Posted from my mobile device
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