Question Simplify the expression −a−4 Evaluate a2−a3−4a2Use b−a=−ba=−ba to rewrite the fraction −a2a3+4a2Factor −a2a2(a+4)Reduce the fraction −(a+4)Solution −a−4 Show Solution Find the excluded values a=0 Evaluate a2−a3−4a2To find the excluded values,set the denominators equal to 0 a2=0Solution a=0 Show Solution Find the roots a=−4 Evaluate a2−a3−4a2To find the roots of the expression,set the expression equal to 0 a2−a3−4a2=0The only way a power can not be 0 is when the base not equals 0 a2−a3−4a2=0,a=0Calculate a2−a3−4a2=0Divide the terms More Steps Evaluate a2−a3−4a2Use b−a=−ba=−ba to rewrite the fraction −a2a3+4a2Factor −a2a2(a+4)Reduce the fraction −(a+4)Calculate −a−4 −a−4=0Move the constant to the right-hand side and change its sign −a=0+4Removing 0 doesn't change the value,so remove it from the expression −a=4Change the signs on both sides of the equation a=−4Check if the solution is in the defined range a=−4,a=0Solution a=−4 Show Solution