1.What is the complete factored form of the expression y⁴ — 49?
A.(y²)² — (7²)²
B. (y² — 7)²
C.(y² + 7)²
D.(y² —7) (y² + 7)
2.which of the following polynomials has factory (xy—1)(xy +1)?
A.x²y — 1
B.x²y² — 1
C.xy² — 1
D.x²y² + 1
3.which of the following expressions is a perfect cube?
A.8x
B.27x²
C.64x6
D. 125x⁴
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