Chapter ISG, Problem 9.9.1.1P

To determine

To solve eauation.

  $2.2x^2+x+1={1.8}^x+5$

Answer to Problem 9.9.1.1P

  $x=-2$

  $x=1$

  $x=9$

Explanation of Solution

Given information:

  $2.2x^2+x+1={1.8}^x+5$

Calculation:

  $2.2x^2+x+1={1.8}^x+5$

Table

  

From table

At $x\approx -1.65$ ,

Then

  $2.2x^2+x+1={1.8}^x+5$

Left hand side equal to right hand side

At $x\approx 1.49$ ,

Then

  $2.2x^2+x+1={1.8}^x+5$

Left hand side equal to right hand side

At $x\approx 8.78$ ,

Then

  $2.2x^2+x+1={1.8}^x+5$

Left hand side equal to right hand side

These are points are the solution of the equation

Then approximate answer are

  $x=-2$

  $x=1$

  $x=9$