Question Simplify the expression 30−12a Evaluate 50−12a−20Solution 30−12a Show Solution Factor the expression 6(5−2a) Evaluate 50−12a−20Subtract the numbers 30−12aSolution 6(5−2a) Show Solution Find the roots a=25Alternative Form a=2.5 Evaluate 50−12a−20To find the roots of the expression,set the expression equal to 0 50−12a−20=0Subtract the numbers 30−12a=0Move the constant to the right-hand side and change its sign −12a=0−30Removing 0 doesn't change the value,so remove it from the expression −12a=−30Change the signs on both sides of the equation 12a=30Divide both sides 1212a=1230Divide the numbers a=1230Solution a=25Alternative Form a=2.5 Show Solution