126k views
3 votes
I just need the answer

User Elthan
by
8.5k points

1 Answer

3 votes

To identify the grpah correspondig to the given function find the zeros of the function (use the quadratic formula):


\begin{gathered} f(x)=(1)/(2)x^2+2x-6 \\ \\ x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a} \\ \\ a=(1)/(2) \\ \\ b=2 \\ c=-6 \\ \\ \\ x=\frac{-2\pm\sqrt[]{2^2-4((1)/(2))(-6)}}{2((1)/(2))} \\ \\ x=\frac{-2\pm\sqrt[]{4-(-12)}}{1} \\ \\ x=\frac{-2\pm\sqrt[]{16}}{1} \\ \\ x=(-2\pm4)/(1) \\ \\ x_1=-2+4=2 \\ x_2=-2-4=-6 \end{gathered}

As the zeros are 2 and -6 the graph cross the x-axis in x=2 and x=-6

Answer: D

User OfficeYA
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories