Which of the following quadratic equations has real but irrational roots?

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Which of the following quadratic equations has real but irrational roots? (a)

x^2 - 2x + 1 = 0

(b)

2x^2 + 3x + 5 = 0

(c)

x^2 + 4x + 2 = 0

(d)

3x^2 + 5x + 2 = 0