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18a+25b a+9b
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18a *(with a square of 2) +25ab-3b* (with a square of 2) 4a *(with a square of number 2) – 9b *(with a square of number 2)
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OR as you tried to show
18a+25b a+9b
----------------------------------------------------- - ------------------------------------
18a *(with a square of 2) +25ab-3b* (with a square of 2) 4a *(with a square of number 2) – 9b *(with a square of number 2)
To write your expression PROPERLY, do in pure text like this:
(18a+25b)/(18a^2+25ab-3b^2)-(a+ab)/(4a^2-9b^2)
or same as