Question

15. 1 - 18z - 63z2 factorise it​

Answer 1

Answer:

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Answer 2

Answer:

$1 - 18z - {63z}^{2} \\ - {63z}^{2} - 18z + 1 \\ - 63 \times 1 = - 63 \\ - 63 = 3 \times - 21 \\ - 21 + 3 = - 18 \\ = - {63z}^{2} - 21 z+ 3 z+ 1 \\ = - 21z(3z + 1) + 1(3z + 1) \\ = (3z + 1)( - 21z + 1)$