Add 3sqrt(21) + 7sqrt(21) (1 point)
O 10sqrt(42)
○ sqrt(52)
O sqrt(24) + sqrt(28)
○ 10sqrt(21)
3sqrt(21) + 7sqrt(21) simplifies to 10sqrt(21)
To simplify the given expression, 3sqrt(21) + 7sqrt(21), we can combine the terms that have the same radical. Since both terms have sqrt(21), we can add them together:
3sqrt(21) + 7sqrt(21) = (3 + 7)sqrt(21) = 10sqrt(21)
Therefore, the simplified expression is 10sqrt(21).
The correct answer is:
○ 10sqrt(21) (1 point)
To solve the expression 3sqrt(21) + 7sqrt(21), we can simplify it by combining the similar terms. In this case, both terms have the square root of 21. So, we can add them together.
3sqrt(21) + 7sqrt(21) = (3 + 7)sqrt(21)
= 10sqrt(21)
Therefore, the simplified expression is 10sqrt(21). So, the correct answer is O 10sqrt(21).