4X = 16X2
4X - 16X2 = 0
(1 - 4X)4X = 0
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as you see
X = 0
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1 - 4X = 0
- 4X = - 1
X = 1/4
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So, X = 0 and X = 1/4. You check.
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4x times 4x equals 16x2.
16x2 - 25 = (4x + 5) ( 4x - 5)
16x2 - 25 = (4x + 5) (4x - 5)
There is a formula for the "difference of squares." In this case, the answer is (4x + 3)(4x - 3)
16x2+56xy+49y2