exam Maths Puzzle Numerical Ability

solve the equation
lnx^-2=x^2

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exam Other Question

If f(x)=x(x+3)(x-1), use the interval notation to give all values of x where f(x)>0. I hope I am in the right section but I am completly loss with this.

If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0.

a. (-infinity,0)U(4,inf