add 3√21 + 7√21
To simplify the given expression, we can combine like terms. However, we cannot combine the terms "3√21" and "7√21" since they have different coefficients.
Therefore, the answer is: 3√21 + 7√21 = 10√21.
To add 3√21 and 7√21, you can combine the coefficients (numbers in front of the square root) and keep the same radical term (√21).
3√21 + 7√21 equals (3 + 7)√21, which simplifies to 10√21.
Therefore, 3√21 + 7√21 = 10√21.
To add the expression 3√21 + 7√21, notice that both terms have the same radical (√21). This means they can be combined.
Step 1: Add the coefficients (numbers outside the radical):
3 + 7 = 10
Step 2: Keep the radical (√21) the same:
√21
So, 3√21 + 7√21 simplifies to 10√21.