Which are perfect square trinomials and which are not?
1. 4k⁴- 4k²m + m²
2. b² – 4b + 16
3. 4d² + 20d – 25
4. 9 + 9e + e²
Answer:
- perfect square trinomials
- perfect square trinomials
- not perfect square trinomials
- not perfect square trinomials
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