1) x²-144
2) (2b+3a)(2b-3a)=4b²-9a²
3)(n-4n³)(n+4n³)=n²-16n⁶
1) 196-x²
2) (3b+5a)(3b-5a)=9b²-25a²
3) (n+2n²)(n-2n²)=n²-4n⁴
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Answers & Comments
1) x²-144
2) (2b+3a)(2b-3a)=4b²-9a²
3)(n-4n³)(n+4n³)=n²-16n⁶
1) 196-x²
2) (3b+5a)(3b-5a)=9b²-25a²
3) (n+2n²)(n-2n²)=n²-4n⁴