I got 11.28. By subtracting 9.72 by 21 to get x alone
The answer is <span>49x2 _ 84x + 36
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(7x - 6)² is the square of the difference. The general formula would be:
(a - b)² = a² - 2ab + b²
In our expression (7x - 6)², a would be 7x and b would be 6:
(7x - 6)² = (7x)² - 2 · 7x · 6 + 6²
= 7² · x² - 84x + 36
= 49x² - 84x + 36
The answer is 150in squared.
Because the SA of one side is 5*5 which is 25, and since all of the sides are equal and there are six sides you multiply 25 by 6, which equals 150.
