Algebrahard · Past Paper
If α, β are roots of x^2 + px + q = 0, find (α-β)^2.
Ap^2 - 4q
Bp^2 + 4q
Cq^2 - 4p
Dp^2 - 2q
✓ Correct Answer: A — p^2 - 4q
(α-β)^2 = (α+β)^2 - 4αβ = (-p)^2 - 4q = p^2 - 4q.
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✓ Correct Answer: A — p^2 - 4q
(α-β)^2 = (α+β)^2 - 4αβ = (-p)^2 - 4q = p^2 - 4q.
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