exam Maths Puzzle Numerical Ability

Identify the axis of symmetry, create a suitable
table of values, and sketch the graph (including the axis of symmetry.
Another one im stuck on. grrr
y = -x^2+6x-2

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exam Other Question
How do i calculate the value of the discriminant of x^2+x+3=0 I forgot to give you the P which is the principal amount initially deposited of 10,000 and 10% rate and the t which is 2 years.