I need help solving the following inequality by using a graphical method. And I have to type the solution set in interval notation. 2x2-3x (> or =) 20

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter5: Linear Inequalities
Section5.3: Solving Multi-step Inequalities
Problem 63PFA
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I need help solving the following inequality by using a graphical method. And I have to type the solution set in interval notation.

2x2-3x (> or =) 20

 

I couldn't figure out how to make a greater or equal to sign..

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