Question

Evaluate : 2(x2 - 1) = (x - 1) if x = 49
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Answer 1

Step-by-step explanation:

$if \: x = 49 \\ 2(x {}^{2} - 1) = (x - 1) \\ 2(49 {}^{2} - 1) = (49 - 1 ) \\ 2(49 {}^{2} - 1 {}^{2}) = 48 \\ 2(49 + 1)(49 - 1) = 48 \\ 2 \times 50 \times 48 = 48 \\ 4800 = 48 \: ans$

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