Question

c-9 +9ab -abc =?
factorise​

Answer 1

∴ c – 9 + 9ab –abc

= c – 9 – abc + 9ab

= 1(c – 9) – ab(c – 9)

= (c – 9)(1 – ab)

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Answer 2

(c - 9)(1 - ab) is the answer.

Given

c-9 +9ab -abc

To Find

Factorisation of c-9 +9ab -abc

Solution

To factorise any expression we have to express them as a product of terms that cannot be further factorised into products.

                                          c-9 +9ab -abc

Taking ab common from 9ab -abc we get

                                          c - 9 + ab(9 - c)

To make a term common, we will put a minus sign before ab to get

                                           c - 9 -ab(c - 9)

Now, taking c - 9 common we get

                                            (c - 9)(1 - ab)

Hence, (c - 9)(1 - ab) is the answer.

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