book Maths Puzzle Numerical Ability

identify the root to the nearest tenth.
y=2x^4+x^2-3

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book Other Question

I am having problems factoring the following problem...can you help please?

5x(3)y(2) + 15x(2)y(3)

The numbers in parentheses are the exponents....thanks find an equation of the line containing the points (-3,2)and having slope 3