Question Simplify the expression 10−20a Evaluate 15−20a−5Solution 10−20a Show Solution Factor the expression 10(1−2a) Evaluate 15−20a−5Subtract the numbers 10−20aSolution 10(1−2a) Show Solution Find the roots a=21Alternative Form a=0.5 Evaluate 15−20a−5To find the roots of the expression,set the expression equal to 0 15−20a−5=0Subtract the numbers 10−20a=0Move the constant to the right-hand side and change its sign −20a=0−10Removing 0 doesn't change the value,so remove it from the expression −20a=−10Change the signs on both sides of the equation 20a=10Divide both sides 2020a=2010Divide the numbers a=2010Solution a=21Alternative Form a=0.5 Show Solution