Question 231678
The short answer: an equal sign.<br>
Expressions:<ul><li>Can only be simplified. For example:<ul><li>Order of operations (aka PEMDAS/GEMDAS</li><li>Reduce fractions</li><li>Rationalize denominators</li></ul></li><li>Express an idea. Examples:<ul><li>Twice a number: 2x</li><li>3 less than the square of a number: {{{x^2 -3}}}</li></ul></li></ul>
Equations:<ul><li>Can be solved.</li><li>Make a statement. Examples:<ul><li>Twice a number is 26: 2x = 26</li><li>3 less than the square of a number is 6: {{{x^2 -3 = 6}}}</li></ul></li><li>Are formed by two expressions separated by an equals sign.</li></ul>