Question Simplify the expression 20−9d Evaluate 20−d×9Solution 20−9d Show Solution Find the roots d=920Alternative Form d=2.2˙ Evaluate 20−d×9To find the roots of the expression,set the expression equal to 0 20−d×9=0Use the commutative property to reorder the terms 20−9d=0Move the constant to the right-hand side and change its sign −9d=0−20Removing 0 doesn't change the value,so remove it from the expression −9d=−20Change the signs on both sides of the equation 9d=20Divide both sides 99d=920Solution d=920Alternative Form d=2.2˙ Show Solution