Question

Разложить на множители (c-3)^2-(c+3)(3-c)

Answer 1

${(c - 3)}^{2} - (c + 3)(3 - c) = \\ {(c - 3)}^{2} + (c + 3)( c - 3) = (c - 3)(c - 3 + c + 3) = 2c(c - 3)$

Answer 2

(c-3)²-(9-c²)=c²-6c+9-9+c²=2c²-6c=2c(c-3)