If a and b are the roots of x2 - 8x + 28 = 0, then a quadratic equation whose roots are a2 and b2 is:

Which of the following equations has the sum of its roots equal to 3?

The quadratic equation corresponding to the roots 1 + √3 and 1 - √3 is:

The equation x4 - 5x2 + 4 = 0 is reducible to a quadratic equation by substituting: