- Math question without a calculator, 25 minutes, 20 questions
2x2-4x-t = 0
b2-4ac = 16 - 4*2 * (-t) = 16 + 8t
16 + 8t >0 2 + t > 0, t> -2
I see if this function has a solution. T must be greater than -2. Not -3 is not a solution. But actually it asks if this function has no solution, 16 + 8t < 0 t < -2, so -3 is a solution. Both ways get the right answer. It is like logic, if p, then q. Thus, if not q, then not p.
- Math question with a calculator, 55 minutes, 38 questions
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