A negative times a negative is always positive. To see why this is, see the link below.
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No because no 2 numbers can be squared to equal 4. 1 squared is 1 2 squared is 4 so the lowest answer is 5.
Two plus 3 minus 2 times 1 squared plus 4 times 16 squared minus 4 times 2 is equal to 1,019.
3n2-8n+4 = (3n-2)(n-2) when factored
(a + 2 - b) (a + 2 + b)
4x2 + 1 + x2 + 3 = 5x2 + 4