Question

A^2+a\a^2-9 - 7a-9\a^2-9 при а=7

Answer 1

I hope this helps you

Answer 2

To evaluate the expression, let's substitute the value of "a" into the given expression.

Given expression: (A^2 + a) / (a^2 - 9) - (7a - 9) / (a^2 - 9)

Substituting a = 7:

= (A^2 + 7) / (7^2 - 9) - (7 * 7 - 9) / (7^2 - 9)

Simplifying further:

= (A^2 + 7) / (49 - 9) - (49 - 9) / (49 - 9)

= (A^2 + 7) / 40 - 40 / 40

= (A^2 + 7) / 40 - 1

= (A^2 + 7 - 40) / 40

= (A^2 - 33) / 40

So, when a = 7, the expression (A^2 + a) / (a^2 - 9) - (7a - 9) / (a^2 - 9) simplifies to (A^2 - 33) / 40.