Question

factorise fully:
21a-7a²
if you can solve this thanks ive struggled on it for a while now

Answer 1

Step-by-step explanation:

First Rearrange it

7a2 - 21a

Both have table of 7 and a common

7a ( a - 3)

This is the answer

Answer 2

Answer:

$7a( - a + 3)$

Step-by-step explanation:

How to factor:

Factoring identities:

$a)(x + y {)}^{2} \\ = (x + y)(x + y) \\ = {x}^{2} + 2xy + {y}^{2} \\ b)(x - y {)}^{2} \\ = (x - y)(x - y) \\ = {x}^{2} - 2xy + {y}^{2} \\ c) {x}^{2} - {y}^{2} \\ = (x + y)(x - y)$

Hope this will help :D

Brainliest would be appreciated