What approximate value will come in place of the question mark (?) in following equations ?
$$42.07 \times 7.998 + (?)^{2} = 20^2$$
Expression : $$42.07 \times 7.998 + (?)^{2} = 20^2$$
=> $$(42 \times 8) + (?)^2 = 20^2$$
=> $$?^2 = 400 - 336 = 64$$
=> $$? = \sqrt{64} = 8$$
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