a+9/4-a^2 .5a-10/5a+45?

Presentation leaves a lot to be desired.

Will assume :-

[ (a + 9) / (4 - a²) ] [ (5a - 10) / (5a + 45) ]

(a + 9) (5) (a - 2)
--------------------------------
(2 - a) (2 + a) (5) (a + 9)

a - 2
-------------------------
(2 - a)(2 + a)

- (2 - a)
--------------------------
(2 - a)(2 + a)

- 1
--------------
( 2 + a )

PS
Remember to use brackets !

how bout please?

[(a + 9)/(4 - a^2)][(5a - 10)/(5a + 45)]
= [(a + 9)/(2^2 - a^2)][5(a - 2)/5(a + 9)]
= [(a + 9)/(2 + a)(2 - a)][(a - 2)/(a + 9)]
= [-(a + 9)/(a + 2)(a - 2)][(a - 2)/(a + 9)]
= -1/(a + 2)

WRITE SIMPLE YOURSELF FIRST
IS A=a
(a^2.5a)-10/5a+45 is tru or a^(2.5a-10/5a+45) ?

a+9/4-a^2 .5a-10/5a+45 = -- 1/(a + 2)

parenthesis??