Question

If AB x B= 7B, then the value of B - A
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Answer 1

Answer:

$ab \times b = 7b \\ ab {}^{2} = 7b \\ ab = 7 \\ b =7 \div a \\ b - a = 7 \div a - a \\ 7 - a { }^{2} \div a = 0 \\ 7 - a {}^{2} = 0 \\ 7 = a {}^{2} \\ a = \sqrt{7}$

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