This is a QC question

Could someone help me solve this using concept or a trick?

try squaring on both sides

Quantity B is 6.

Quantity A is at least 7: \sqrt{21} > 4 and \sqrt{15} > 3.

This is a QC question

Could someone help me solve this using concept or a trick?

try squaring on both sides

Quantity B is 6.

Quantity A is at least 7: \sqrt{21} > 4 and \sqrt{15} > 3.