Which expressions represent a perfect square monomial and its square root? Check all that apply.121; 114x2; 2x9x2 – 1; 3x - 125x; 5x49x4; 7x2
(x – 16)(x + 1)(x – 4)(x – 4)(x + 4)(x + 4)✔ (x – 4)(x + 4)
–16 and 1–8 and 2✔ –4 and 4–1 and 16
(x – 16)(x + 1)(x – 4)(x + 4) ✔ (4x– 1)(4x+ 1)(x – 1)(16x + 1)
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