The value of the discriminant of the equation, x^2 - (√2 + 1)x + √2 = 0 is: 1. 3 + 2√2 2. 1 - 2√2 3. 3 - 2√2 4. 2 -√2

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If the equation, ax² + 2x + a = 0 has two real and equal roots, then:
a = 0, 1
a = 1, 1
a = 0, -1
a = -1, 1