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Give the equation of the function whose graph is described.

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1 Answer

y = x2
 
To shift 4 units to the right, replace x with (x-4).  (To shift left, replace x with (x+4))
 
    y = (x-4)2
 
To stretch vertically by a factor of 5, multiply (x-4) by 5
 
    y = 5(x-4)2
 
To reflect across the x-axis, change the sign of 5
 
    y = -5(x-4)2
 
To shift up by 8, simply add 8 to the expression:
 
    y = -5(x-4)2 + 8
 
Finally, multiply out the term -5(x-4)2 and simplify to get the answer.