exam Maths Puzzle Numerical Ability

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32: In angle ABC, A is the vertex.

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I= E/R+r for rfor r. Hello can you help me with this.
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?
Thanks