exam Maths Puzzle Numerical Ability

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

a. -1
b. 0
c. 14
d. 15
e. 16

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exam Other Question

6-g(g-7)6-8g please help with the following equation.It is asking about the DEGREE,DOMAIN,RANGE, Y-INT,BEHAVIOR,POTENTIAL ZEROS, TURNING POINTS, DESCARTES RULE,REAL ZEROS. f(x)=X^4+4X^3-X^2-16X