Question 131

$$18 \times 8 + (?)^{2} = (15)^{2}$$

Solution
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Expression : $$18 \times 8 + (?)^{2} = (15)^{2}$$

=> $$144 + ?^2 = 225$$

=> $$? = \sqrt{225 - 144} = \sqrt{81}$$

=> $$? = 9$$

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