Square Of A Binomial. (A - 9) 2 Squared. So What Is The Answer? With Explanation.

Square of a binomial. (a - 9) 2 squared. So what is the answer? with explanation.

 

Answer:

a^2-18a+81

Step-by-step explanation:

square the first term which is the a. (a*a)=a^2

twice the first term and last term. (a*9)*2 =18a

square the last term which is -9. (-9)(-9) =81

when negative multiply by negative, the answer is positive.

when positive multiply by negative, the answer is negative.

when positive multiply by positive, the answer is positive.