exam Maths Puzzle Numerical Ability

The number of real roots of the equation 2x4 + 5x2 + 3 = 0 is

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Please help me understand by describing and explaining how you could use the graph of f (x) = 2^x to obtain a decimal approximation for the (sqrt function) and the number 2 . (I c will you please solve this problem for me it will be greatly appreciated:

solve: (n)/(n-3) + n=(7n-18)/(n-3)