Question

Multiply and simplify:

Answer 1

\[\frac{ x^2-81 }{ x^2+18+81 } * \frac{ x+9 }{ x-9 }\]

Answer 2

answers:

a)
x+9
----
x-9

b)
1
---
x+9

c)
0


d)
1

Answer 3

hello
u can write the
right hand side numerator using the "difference of 2 squares"
\[x ^{2} - 81 = (x -9)(x + 9)\]

and u can factorize the denominator of the right hand side as
\[x ^{2} + 18x + 9 = (x + 9 )^{2}\]

now re-write the expression by substituting those values and u could simplify it easily

Did u get it ?

Answer 4

Have you considered factoring everything?

Answer 5

Just factor quadratics, and do some cancellation and see what will happen. :)