exam Maths Puzzle Numerical Ability

If f(x)=x^2-6x+8, what is the value of f(7)-f(3)?

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exam Other Question

Graph the inequality and shade in the correct area of the graph:
2/3x + 3y<or equal to 12 Why is a quadratic equation called a quadratic? Quad means 4 and nothing in the equation has it.