Question

Factorise it.
please it's urgent today my maths n.b. will check but I can't able to this question. please help me.
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Answer 1

Step-by-step explanation:

$- {b}^{2} + b + 42 \\ = - {b}^{2} - 6b +7 b + 42 \\ = - b(b + 6) + 7(b + 6) \\ = (b + 6)(7 - b)$

Answer 2

Answer:

Your answer is in attachment