Question

78²-22²=100X=??????????????​

Answer 1

Answer:

here we should use the formula

a^2 - b^2 = (a + b) (a - b)

78^2 - 22 ^2 = 100x

(78 + 22) (78-22) = 100x

100×56 = 100x

5600 = 100x

5600/100 = x

x = 56

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