Q. Complete the square to re-write the quadratic function in vertex form:y=x2−6x+1Answer: y=
Identify Coefficient and Half: To complete the square, we need to form a perfect square trinomial from the quadratic and linear terms of the function. The vertex form of a quadratic function is y=a(x−h)2+k, where (h,k) is the vertex of the parabola.
Add and Subtract to Complete Square: First, we identify the coefficient of the x term, which is −6. To form a perfect square trinomial, we take half of this coefficient, square it, and add it to and subtract it from the expression to maintain equality.Half of −6 is −3, and (−3)2 is 9.
Group and Combine Constants: We add and subtract 9 within the function to complete the square:y=x2−6x+9−9+1
Factor Perfect Square Trinomial: Now, we group the perfect square trinomial and combine the constants:y=(x2−6x+9)−8
Rewrite in Vertex Form: The perfect square trinomial x2−6x+9 can be factored into (x−3)2:y=(x−3)2−8
Rewrite in Vertex Form: The perfect square trinomial x2−6x+9 can be factored into (x−3)2:y=(x−3)2−8We have now rewritten the quadratic function in vertex form. The vertex form of the function is y=(x−3)2−8.
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