<span>2x^2 - 2x - 1 = 0 a = 2, b = -2, c = -1 b^2 - 4ac = (-2)^2 - 4(2)(-1) = 4 + 8 = 12
so the answer is 12
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<span>No, because postulates are assumptions. Some true, some not. So it can't be used to prove it</span>
Answer:
It is a equation
Step-by-step explanation:
Because it has an equal sign if it does not it will be a expression.
