This is a difference of squares, so we can simplify using the formula:
(a + b)(a - b) = a^2 - b^2
In this case, let a = 5x and b = 6:
(5x + 6)(5x - 6) = (5x)^2 - (6)^2
= 25x^2 - 36
So the simplified expression is:
25x^2 - 36
(5x + 6)(5x – 6)
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