4X stands for four-times-faster than the original AGP specs for those graphics cards. Note that 4X is different per manufacturer, so read the entire box before making an informed decision on which card to pick up.
CNET.com has good articles on this subject.
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10x + 7 = 4x + 49 6x + 7 = 49 6x = 42 x = 6
4x * x = 4x^2
ANSWER: -4X2 -8X-4x (x+2)= (-4x * x) + (-4x*2)= -4X2 -8X
If that's +4x, the answer is (x - 4)(x + 8) If that's -4x, the answer is (x + 4)(x - 8)
5x x 4x = 20x^2 5x + x + 4x = 10x