book Maths Puzzle Numerical Ability

solve the inequality,state the solution set using interval notation and graph the solution set.
4x^2-8x greater than or equal to 0

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book Other Question

K(x+2)^2 - (x-1)(x-2) is equal to zero for only one value of x. (K is not equal to 1) what is the value of k The set of real numbers less than or equal to -4