exam Maths Puzzle Numerical Ability

Simplify the following:
1 3x2 + 4x + 3x2 - 4y

2. (5x - 2y) - (4x + 8y)

3. 3x3(2x2)

4. (-6a3b4)2
Can you PLEASE HELP ME WITH THESE! THANK YOU SO MUCH

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exam Other Question
Given y = 2x^2 - 4X, thanks.

A) find the y-intercept
b) Find the X-intercepts (if any).
c) find the vertex.
d) Sketch the parabola how do i find the intercept in a linear form?