exam Maths Puzzle Numerical Ability

Please help me find all rational numbers for which the rational expression is not defined. x^2+x+105 over 5x-45.

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exam Other Question

For the function f(x)=x^2(x-2)
a) find the x intercepts, for each intercept, indicate whether the graph of f crosses (C) or touches (T) the x axis at each intercept.

b)Find the Factor completely x^3 + 6x^2 + 5x I thought i had it and realize that i didnt. Help please..