It is an algebraic expression
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Ah, what a delightful question! When you have x4 plus x4, you can simply add the two terms together. It's like having 4 happy little birds on one branch and then adding 4 more joyful birds to join them, giving you a total of 8 lovely birds sitting together.
4X + 2x = 1. Where x = 0.166666666666666666666666666666666666666 recurring.
(x - 1)(x - 4)(x + 1)(x + 4)
I is 64 + k. No more can be said about it without further information about k.
10x2 - 64 = 36 + 6x2; whence, 4x2 - 100 = 0, x2 = 25, and x = ±5.