Question

раздожите на множители(7x-3x^3)^2​

Answer 1

$(7x-3x^3)^2=Big (xcdot (7-3x^2)Big )^2=x^2cdot (7-3x^2)^2=\\=x^2cdot (sqrt7-sqrt3x)^2cdot (sqrt7+sqrt3x)^2$