Question

A2-9a+20 write factorisation

Answer 1

Answer:

the factors are (a-4) (a-5)

the method is middle term splitting

Step-by-step explanation:

${a}^{2} - 9a + 20$

=

${a}^{2} - 5a - 4a + 20$

=

$a(a - 5) \: - 4(a - 5)$

=

$(a - 4)(a - 5)$