exam Maths Puzzle Numerical Ability

a) Solve 2x^2=6 (my solution is x=sqrt3, -sqrt3.
b) Find the x-intercepts of f(x)=2x^2-6

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exam Other Question

please help me solve this equation, i know this is an easy problem but i have to make sure its right.

.2r=68

i divided 68 by 2 and got 340 and that dosent seem right to me
The point (-1/2,sqrt3/2) on the unit circle is rotated 60degrees clockwise. Determine the coordinates of the new point.
Please help.