Q: Is 49x2-56x plus 16 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

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No, consider 16 + 25 ...

16

True

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

16 is a perfect square.

the perfect square of 4 is 16

16 is a perfect square: 4 by 4 by 4 by 4.

No. But it's only (8x) bigger than one perfect square, (24x) bigger than another one, and (48) smaller than another one.

True