Question

x^4-16x^2-36 solve this factorisation​

Answer 1

x⁴ - 16x² - 36

= x⁴ + 2x² - 18x² - 36

= x²(x² + 2) - 18(x² + 2)

= (x² - 18)(x² + 2)

= [(x)² - (√18)²](x² + 2)

= (x - √18)(x + √18)(x² + 2).