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It's not, 4x4=16.
It is: 3*4 = 4*3 which is the same as 12 = 12
28 is.
7
yes
Not necessarily.
x4/12 since derivative of x4/12 is 4x3/12 or x3/3
N = x4 x8 = x4+4 = (x4)2 = N2
30 times 4 equals 120
9 x 4 = 36
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)
6 x2 12 x4 48 x2 96 x4 384