exam Maths Puzzle Numerical Ability

Solve by using the quadratic formula:

Z squared + 4z + 1 = 0

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exam Other Question

how would you work this out 4xcubed-13xsquared+11x-2=0
also I got this problem to do it's 2xsquared+3x+1=0 I got this answer x=1/2 and x=-1 is this right What is Inverse Variation and how do you begin to graph the equation for an inverse variation?