Final answer:
To simplify the given expression, combine like terms.
Step-by-step explanation:
To simplify the expression (5a-3^2)+(3a+9a^2), we need to combine like terms. The expression contains similar terms in the form of 'a' and 'a^2'. Starting with the 'a' terms, we have 5a+3a which equals 8a. Next, we have the 'a^2' terms which are 9a^2. Combining these terms, the simplified expression is 8a + 9a^2.
Learn more about Simplifying mathematical expressions