Question

Factorise each of the following expressions completely.
i
a2 + a - 20
ii
6² - b - 12
iii
c2 - 11c + 28​

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Answer 1

1.)a2−a−20 =a2−5a+4a−20

=a(a−5)+4(a−5)

=(a−5)(a+4)

2. It's incorrect question