Posted by **Erica** on Monday, December 5, 2011 at 12:42pm.

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

- Algebra 2 -
**Reiny**, Monday, December 5, 2011 at 1:25pm
take half the middle term coefficient, square it

x^2 - 23x + 526/4

= (x- 23/2)^2

looks like you learning the process of "completing the square"

here is an easier one ...

x^2 + 10x + c

or

x^2 + 10x + **25** ,,,,,(half of 10 is 5, 5^2 = 25)

= (x+5)^2

expand (x+5)^2 to see why this happens

Now try your own second question and let me know what you got for c .

## Answer this Question

## Related Questions

- algebra 2 - find the value of c that makes each trinomial a perfect square. then...
- algebra - FIND THE VALUE OF K, SO THAT THE EXPRESSION IS A PERFECT SQUARE ...
- Math - The value of k that makes the expression x^2 + 72x +k a perfect square ...
- Algebra 1 - m(squared)-8m+n Find the value on n such that each expression is a ...
- Algebra 1 - 1. What is the excluded value for the rational expression x^2 - 4/3x...
- Alg 1 - Completing the square: Find the value of c such that each expression is ...
- Algebra 1 - What is the value of n so that the expression x^2+11x+n is a perfect...
- math,help - Is this trinomial a perfect square x^2-6x+9 if the trinomial starts ...
- Algebra - What is the value of n so that the expression x² + 11x + n is a ...
- algebra - I am confused on how to determine if an equation/expression is a ...

More Related Questions