exam Maths Puzzle Numerical Ability

Factor completely.
3x^2 - 23x + 40

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exam Other Question

define the relationshipof (x,y) specified {y=1-!x! if -1<= x <=1;
y=1/2 if -1/2 < x < 1/2 solve for x in simplest a+bi form:4x^2+17=4x