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Anonymous
4a-2 = 2
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6A
6
(2a + 1)(2a - 5)
= 4a2 + 2ab 2b2
3a4 - 2a2 + 5a - 10 - 2a4 + 4a2 + 5a - 2 = a4 + 2a2 + 10a - 12 = a4 + (2a - 2)(a + 6)
x2=(4a)(a) x=√4a2 x=2a The geometric mean of a and 4a is 2a
4a2+4ab+b2 in2