Instructions

What should come in place of the question mark (?) in the following questions?

Question 140

$$8 \times 5 + (?)^{2} = (11)^{²}$$

Solution

Expression : $$8 \times 5 + (?)^{2} = (11)^{2}$$

=> $$40 + (?)^2 = 121$$

=> $$? = \sqrt{121 - 40} = \sqrt{81}$$

=> $$? = 9$$


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