Question

15 points for someone who can answer & explain this to me thanks

Answer 1

see explanation

Explanation:

Given

`(9)/(a^2+9a+20)` ,
`(7a)/(a^2+11a+28)`

Factor the denominators of both fractions

`(9)/((a+4)(a+5))` ,
`(7a)/((a+4)(a+7))`

The lowest common denominator of both fractions is (a + 4)(a + 5)(a + 7)

Multiply numerator/denominator of first fraction by (a + 7)

Multiply numerator/denominator of second fraction by (a + 5 )

`(9(a+7))/((a+4)(a+5)(a+7))` ,
`(7a(a+5))/((a+4)(a+5)(a+7))` , then

`(9a+63)/((a+4)(a+5)(a+7))` ,
`(7a^2+35a)/((a+4)(a+5)(a+7))`