exam Maths Puzzle Numerical Ability

Find the minimum of P(x) = 3x^2 + 6x - 1.

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exam Other Question

I am not sure if I am in the right area of algebra. I need to know about precision and accuracy.
Example what is the precision and accursay for the following measurements
0.0524c determine if the following is parallel, perpindicular, or neither
y=x+3
y=-x+3