Wednesday

April 16, 2014

April 16, 2014

Posted by **Christian** on Monday, May 21, 2007 at 10:41pm.

1. 4x^2+12x+?

2. ?+90x+81

Could someone show me how to solve these?

Take the first:

factor out the 4

4x^2+12x+?

4( x^2 + 3x + ?)

take half the center term, and square it. half is 3/2, squared is 9/4

4( x^2 + 3x + 9/4)

Put the 4 back in...

4x^2 + 12x+9

(2x+3)(2x+3)

Second:

?+90x+81

Notice the last term is a perfect square, its square root is 9. Twice nine is eighteen.

Now to find the missing term, divide 90 by 18: five.

25x^2 + 90x + 81

(5x+9)(5x+9)

**Related Questions**

trinomial - I need this answer. Which trinomial is a perfect square trinomial? A...

algebra - I am confused on how to determine if an equation/expression is a ...

Math - this question does not make sense to me. Add the proper constant to the ...

Algebra - Complete the square to form a perfect square trinomial. X^2+4x+____ ...

Math check - Complete the square: x^2 -12x. Which of the following is the ...

algebra 1 - find a value for k that will make 4x^2 + 6.4x + k a perfect square. ...

Polynomial Fucntion Problem - Could you help me with the following problem, I ...

algebra 1 - find a value for k that will make 4x^2 + 6.4x + k a perfect square. ...

help...solving a polynomial....algebra - solve this please....help me....12x(...

alg3 - how do i factor the perfect square trinomial 9x2-12x+4