1) (5х-4)(5х+4)
2)(7a^2-2b^3)(7a^2+2b^3)
3)(3x-2y)^2
4)x(x^2-64y^2)=x(x-8y)(x+8y)
5)-7(a+b)^2
6)(m+3n)(m^2-3mn+9n^2)
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Answers & Comments
1) (5х-4)(5х+4)
2)(7a^2-2b^3)(7a^2+2b^3)
3)(3x-2y)^2
4)x(x^2-64y^2)=x(x-8y)(x+8y)
5)-7(a+b)^2
6)(m+3n)(m^2-3mn+9n^2)