Let p(x) = 2x4 - 3x3 - 5x2 + 9x - 3 and two of its zeros are √3 and -√3. Find the other two zeros.
Two zeroes are √3 and -√3,
Therefore (x -√3)(x - (-√3) = (x - √3)(x + √3) is a factor of p(x).
Let us divide p(x) by (x - √3)(x + √3) = (x2 - 3)
⇒ (2x4 - 3x3 - 5x2 + 9x - 3) = (x2 - 3)(2x2 - 3x + 1)
= (x - √3)(x + √3)(2x2 - 2x - x + 1)
= (x - √3)(x + √3)(2x(x - 1) - 1(x - 1))
= (x - √3)(x + √3)(2x - 1)(x - 1)
Hence,
2x - 1 = 0 or x - 1 = 0
or x = 1
Hence, other two zeroes are or 1.