Final answer:
The simplified square root expression is 12 + 14√.
Step-by-step explanation:
To simplify the square root expression, we combine like terms. The square root of 9 is 3, so we have: 4√9 + 14√ - = 4(3) + 14√ - = 12 + 14√ - = 12 + 14√. Therefore, the simplified expression is 12 + 14√.