Question

$30 ^{2} - 117 = 24.5 ^{2} + {?}$
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Answer 1

30^2 – 117 = 24.5^2 + x

900 – 117 = 600.25 + x

783 = 600.25 + x

x = 783 – 600.25

x = 182.75

Check:

900 – 117 = 600.25 + 182.75

783 = 783