Question

Which of the following is equivalent to this expression?

21a + 7

a (21 + 1)
7 (3a + 1)
7 (3a + 7)
3 (7a + 4)

Answer 1

Medal given

Answer 2

PLZ HELP

Answer 3

You know how to factorize?

Answer 4

Whats that?

Answer 5

And no i dont

Answer 6

@tukitw

Answer 7

Will fan

Answer 8

21a + 7
Notice that both 21 and 7 are divisible by 7, that is, 21 = 7 * 3 and 7 = 7 * 1. Since both numbers can be divided by 7, the common factor of the two terms would be 7. To factorise, we will take out the common factor.
21a + 7 = 7(3a + 1)
The reason for the numbers inside the brackets is that 3 = 21 / 7 and 1 = 7 / 7.

Answer 9

oh interesting

Answer 10

Can u help me more