Question

Multiply (3-a) by (5-2a)?

Answer 1

`15 - 11a + 2a^2`

Explanation:

`(3 - a)(5 - 2a)` expanded = `15 - 6a - 5a + 2a^2`
add like terms and you get `15 - 11a + 2a^2`

Answer 2

`2a^2-11a+15`

Explanation:

`(3-a)*(5-2a)`
Multiply each term in the left bracket by each term in the right bracket.
`a` times a number looks like this `a*3=3a`
If you multiply it by itself its like this `a*a=a^2`
so

`3*5 =15`

`3*(-2a)=-6a`

`(-a)*5=-5a`

`(-a)*(-2a)=2a^2`

Arrange in order of `a^2+a+`#

`2a^2-6a-5a+15`
`2a^2-11a+15`