` x^2 - 10x + 24 `
` = x^2 - 4x - 6x + 24 `
` = x(x - 4) - 6(x - 4) `
` = (x - 4)(x - 6) `
` 4x^2 - 25y^2 ` (Sửa)
` = (2x)^2 - (5y)^2 `
` = (2x - 5y)(2x + 5y) `
` x^4 - 16 `
` = (x^2)^2 - 4^2 `
` = (x^2 - 2^2)(x^2 + 2) `
` = (x - 2)(x + 2)(x^2 + 2) `