exam Maths Puzzle Numerical Ability

I am having trouble factoring 6x^6-24x^4+18x^2---I cant figure out what to begin with when I start to factor. Should I take out a 3x^2?

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exam Other Question

Using the quadratic formula, solve the following equation for X.
Express your solution both in radical format and as decimals rounded to two decimal places.

3x^2+9x=-4 Solve the system by graphing.
4x + 2y = 10
y = 4