exam Maths Puzzle Numerical Ability

What is the maximum value of q(x) = (x-4)^2 - 13?

a. -4
b. 4
c. -13
d. There is no maximum value

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solve :

1)Find an equation in slope-intercept form passing through the points (-6.2,18.1) and (-3.4,18.1).
y2+y-6