# algebra

posted by .

I am confused on how to determine if an equation/expression is a trinomial square. For example c^2(squared)-18c+81. I know that this is a trinomial square but I don't know why. Could someone please help me understand better

• algebra -

it is, because (c-9)^2 = c^2-18c+81

## Similar Questions

1. ### math,help

Is this trinomial a perfect square x^2-6x+9 if the trinomial starts with x^2 and 1/2 of the middle term coefficient squared equals the last term, then it is a perfect square. tell me what you found. i thought it was not a perfect square. …
2. ### Math

Find the constant term that should be added to make the following expression a perfect square trinomial. x^2-2x x^2+3x Take one half the second term, square it. 1/2 *2=`1, squred, 1 1/2 *3=3/2, squared, 9/4
3. ### algebra 1

Determine whether each trinomial is a perfect square trinomial. x^2-16x+64
4. ### Algebra (Does any one understand special factors)?

I do not understand special factors, the teacher on Friday tried to explain in to me in class but she went so fast, and every time we complain that we don't understand it she gets mad. So could someone please help me with at least …
5. ### math 118

x^2+10x Add the proper constant to the binomial so tha tthe resulting trinomial is a perfect square trinomial. Then factor the trinomial
6. ### Algebra 1

m(squared)-8m+n Find the value on n such that each expression is a perfect square trinomial.
7. ### trinomial

I need this answer. Which trinomial is a perfect square trinomial?
8. ### Algebra 2

Find the value of c that makes the expression a perfect square trinomial. Then write the expression as the square of a binomial. I didn't really understand what that meant. x^2-23x+c x^2-(2/7)x+c
9. ### Algebra 1

1. What is the excluded value for the rational expression x^2 - 4/3x - 6?
10. ### algebra 2

find the value of c that makes each trinomial a perfect square. then write the trinomial as a prefect square. x^2-10x+c x^2+60x+c

More Similar Questions