Factorise:
$7 b^{2} - 8 b + 1$

(7 b - 1) (7 b - 1)

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(7 b + 1) (b - 1)

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(b + 1) (7 b - 1)

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(b - 1) (7 b - 1)

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Solution

The correct option is D $(b - 1) (7 b - 1)$
$F a c t o r i z i n g {7 b}^{2} - 8 b + 1, S p l i t 8 b a s : = 7 b^{2} - 7 b - b + 1 = 7 b (b - 1) - 1 (b - 1) = (b - 1) (7 b - 1)$

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