factorise 1 - 18z - 63z2
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Answered by
22
1-21z+3z-63z^2
1(1-21z)+3z(1-21z)
(1+3z)(1-21z)
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Answered by
11
(-63z2 -18z+1)
= ( - 63z2- 21z+3z +1)
= [ - 21z(3z+1) + 1(3z+1)]
= (3z+1)( - 21z+1)
= (3z+1)(1-21z)
i hope it will help u
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