Chapter ISG, Problem 9.7.1P

To determine

To solve system graphically.

Answer to Problem 9.7.1P

They cross at $x=-2$ and $x=0$

Explanation of Solution

Given information:

  $y=x^2+3x+1$

  $y=x+1$

Calculation:

  $y=x^2+3x+1$

  $a=1$

  $b=3$

  $c=1$

Central value

  $x=\frac{-b}{2a}$

Put value of a and b

  $x=\frac{-3}{2(1)}=-1.5$

Table

  

Graph:

  

Clear from graph

They cross at $x=-2$ and $x=0$

Points of intersection

  $(-2,-1)$

  $(0,1)$