Question

What is the square of2√21

Answer 1

Answer:

84

Step-by-step explanation:

2

$2 \sqrt{21} \times 2 \sqrt{21 } \\ 4 \times 21 \\ 84$

Answer 2

Step-by-step explanation:

the square of2√21 is

= (2√21)^2

= 4 × 21

= 84