Question

simplify √144+√81 ÷√144-√81​

Answer 1

Answer:

$\sqrt{144} + \sqrt{81} \div \sqrt{144} - \sqrt{81} \\ = \sqrt{12 \times 12} + \sqrt{9 \times 9} \div \sqrt{12 \times 12} - \sqrt{9 \times 9} \\ = 12 + 9 \div 12 - 9 \\ = 21 \div 3 \\ = 7$