49x2 - 56x + 16 = (7x - 4)2 so yes, it can be a perfect square.
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No, consider 16 + 25 ...
16(2)-36+9 32-36+9 -4+9 No, it isn't a perfect square.
16 is a perfect square (of 4) and the square root of 256.
yes, (7x - 4)2
16? using 16, you have (3x2 + 4)(3x2 + 4) = 9x2 + 24x + 16