Multiple choice The value of (8.6)2-(1.4)2 is 72 100 144 121 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Using the difference of squares formula, a^2 - b^2 = (a - b)(a + b). Here, (8.6 - 1.4)(8.6 + 1.4) = (7.2)(10) = 72.