Question

Factorise it
20a^2-a-1

Answer 1

Hey

The answer is in the attachment below

Hope it helps you

Answer 2

${\purple{\boxed{\boxed{\bold{\huge{Solution:-}}}}}}$

$20 {a}^{2} - a - 1 \\ = 20 {a}^{2} - (5 - 4)a - 1 \\ = 20 {a}^{2} - 5a + 4a - 1 \\ = 5a(4a - 1) + 1(4a - 1) \\ = (4a - 1)(5a + 1)$

${\orange{\boxed{\mathfrak{\huge{Thank\:You♡}}}}}$