For simplification, simplify the initial expression. √49•√9=7•3=21
Therefore, we are looking for all following numbers that are equal to 21.
A is approximately 7.6, so that is not one of them.
B, depending on where the parenthesis are, could be true. If it is √(499), then it is correct, as that is equivalent to √441, which is 21. If it is √(49)9, then it is equal to 79, which is 63, not 21. Please check the problem and determine this based on parenthesis!
C is not correct, as is not equal to 21 (I know, kinda stupid explanation, but we proved that √49√9=21.
D is 21, so this one is correct.
E can be simplified by evaluating the square root. √441=21, so this one is correct.
F is not correct, as it is not equal to 21.
So, no matter what, D and E are 2 correct options. Depending on parenthesis, B could also be correct.
Hope this helps!
