Exercise 5 Page 132

For a quadratic function f(x)=ax^2+bx+c, the axis of symmetry is represented by the equation of the vertical line. x=- b/2 aLet's identify the values of a, and b in the given quadratic function. y=x^2-5x+4 ⇕ y= 1x^2 - 5x+4 We can see above that a= 1 and b= - 5. We will now use these values to find the desired information. Let's substitute a= 1 and b= -5 in - b2a.

x=-b/2a

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Substitute values and evaluate

SubstituteII

a= 1, b= -5

x=--5/2* 1

Multiply

Multiply

x=--5/2

RemoveNegFracAndNum

- - a/b= a/b

x=5/2

This tells us that the equation of the axis of symmetry is x= 52.