# 4 3 7=42, 6 3 8=91 5 3 9=?

Solution: It is clear that

$\\ \Rightarrow 7^2-4^2-3^2=49-16-9=24$

Now , change the place of digits .$\\42$

Similarly ,$\\\Rightarrow 8^2-6^2-3^2=64-36-9=19$

Change the place digit $\\91$

Now, $\\ 9^2-5^2-3^2=81-25-9=47$

change the place digit $74$

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