• 120

  • 140

  • 112

  • None of the above


Here, we can apply the formula of a^2 - b^2 = (a + b) (a - b) So, after applying the formula, we will get (64 + 36) (64 - 36) = 20 * x 100 * 28 = 20 * x x = 100 * 28/ 20 = 140

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