exam Maths Puzzle Numerical Ability

Please help me with the following question I have tried it and just don't understand this problem In an auditorium there are 4a rows, and each row can accommodate 5yz benches. If x

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Calculate the value of the discriminant of x^2+4x+4=0 ,By examining the sign of the discriminant in part a, how many x-intercepts would the graph of y=x^2+4x=4 have? Why? Could you help me to simplify with positive exponets
(27x^6y^3)^(1/3)