To solve the expression, we need to first factor the denominator:
a^2 + 3a - 18 = (a + 6)(a - 3)
Now we can rewrite the expression as:
a^2 - 3a / (a + 6)(a - 3)
Therefore, the simplified expression is:
a(a - 3) / (a + 6)(a - 3)
Simplifying further, we get:
a / (a + 6)
To solve the expression, we need to first factor the denominator:
a^2 + 3a - 18 = (a + 6)(a - 3)
Now we can rewrite the expression as:
a^2 - 3a / (a + 6)(a - 3)
Therefore, the simplified expression is:
a(a - 3) / (a + 6)(a - 3)
Simplifying further, we get:
a / (a + 6)