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10 questions from this quiz
If a×b=0a \times b = 0a×b=0, then a=0a = 0a=0 and/or b=0b = 0b=0
x=4x = 4x=4 or x=−2x = -2x=−2
x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}x=2a−b±b2−4ac
Δ=b2−4ac\Delta = b^2 - 4acΔ=b2−4ac
The roots are non-real (complex numbers)
The roots are real and equal
The roots are real and unequal
If Δ\DeltaΔ is a perfect square
Otherwise the equation wouldn't be quadratic
If the quadratic can be factorised
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