Question Simplify the expression −28−a Evaluate 992−915−105−aSolution −28−a Show Solution Find the roots a=−28 Evaluate 992−915−105−aTo find the roots of the expression,set the expression equal to 0 992−915−105−a=0Subtract the numbers 77−105−a=0Subtract the numbers −28−a=0Move the constant to the right-hand side and change its sign −a=0+28Removing 0 doesn't change the value,so remove it from the expression −a=28Solution a=−28 Show Solution