Разложите на множители/ квадрат суммы. квадрат разности
1. b^2 - 16
2. 25a^2 - 81y^2
3. x^2 - 6x + 9
4. 4y^3 - y
1. b^2 - 16
2. 25a^2 - 81y^2
3. x^2 - 6x + 9
4. 4y^3 - y
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Answers & Comments
1)b^2-16=b^2-4^2=(b-4)(b+4)
2) 25a^2-81у^2=(5a-9y)(5y+9y)
3)x^2-6x+9=(x-3)^2
4)4y^3-y=y(4y^2-1)=y(2y-1)(2y+1)