Question

what is the answer to this question

Answer 1

Applying Pythagoras theorem .

$= > {b}^{2} + {6}^{2} = {9}^{2} \\ = > {b}^{2} + 36 = 81 \\ = > {b}^{2} = 45 \\ = > b = \sqrt{45} \\ = > 3 \sqrt{5}$
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Answer 2

b=√81-36

b=√45 is the answer..