Question

phân tích đa thức thành nhân tử

\(81x^4+4\)

Answer 1

81x^4+4

=(9x^2)^2+36x^2+2^2-36x^2

=(9x^2)^2+36x^2+2^2-(6x)^2

=(9x^2+2)^2-(6x)^2

=(9x^2+2-6x)(9x^2+2+6x)

Answer 2

81x⁴ + 4 = ( 9x²)² + 2 ² = ( 9x²)² + 36x² + 2² -  36x² = (9x² + 2)² - (6x)² = (9x² + 2 - 6x)(9x² + 2 + 6x)

XONG

Answer 3

=(84x⁴ + 36x² +4) - 36x²

=(9x² + 2)² - (6x)²

=(9x² + 2 - 6x)(9x² + 2 - 6x)

Answer 4

81x^4+4

=(9x^2)^2+4

=(9x^2)^2+36x^3+2^2

=(9x^2+2)^2