# factoring completly

can anyone help me with these:
3x2 + 17x + 10
5y8 - 125
a2 - 2ab - 15b2
4c2 - 12c + 9

5 y^8 - 125 = 5(y^8 - 25)

y^8 - 25 can be written
(y^4 - 5)(y^4 + 5)

For the others, you need to try a few factors until you find a pair that works. For example,
a^2 - 2ab - 15b^2 = (a+3b)(a-5b)

1. 👍 0
2. 👎 0
3. 👁 90

## Similar Questions

1. ### ALGEBRA

3x2 = 17x + 6

asked by Randy on April 16, 2012
2. ### Math

1.3x^2+17x+10 2.5y^8-125 3.a^2-2ab-15b^2 *Please help me.You have to factor by completing. Let's look at #1: 3x^2 + 17x + 10 We have 2 and 5 as factors of the last term. What combinations can we do to arrive at the middle term?

asked by Alex on February 4, 2007
3. ### Integrated Math 1

The parabolas y = -3x2 + 10x - 6 and y = -3x2 - 17x + 2 intersect at _____? A.the line y = 27x - 8. B. x=the square root of 2 over 3 and xthe -square root of 2 over 3. C. x=8/27. D. they do not intersect.

asked by Tifini on July 8, 2012
4. ### college math

use long division 1.2x3+3x2-17x+1 /x-2 2.y3+3y2+1 /y-2 3.n5-n2 /n2-n

asked by erin on November 11, 2011
5. ### Algebra

(x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this is how far I got. The answer I know is -(5x^2-17x-9)/(x-3)(x+2) first I get (x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2) Then I get

asked by Sara on July 20, 2007
6. ### Algebra

(x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this is how far I got. The answer I know is -(5x^2-17x-9)/(x-3)(x+2) first I get (x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2) Then I get

asked by Sara on July 20, 2007
7. ### statistics

Use the list and calculation method to answer the following questions. Show your work at each step. 4. You draw three cards (with replacement) from a standard deck of cards. What is the probability that a. exactly one will be red:

asked by Lynn on June 7, 2013
8. ### algebra

Can someone please explain What polynomial has a graph that passes through the given points? (–4, 89), (–3, 7), (–1, –1), (1, –1), (4, 329) y = 2x3 – 3x2 – 2x + 1 y = 1x4 – 2x3 – 3x2 + 2x + 1 y = x4 – 2x3 + 3x2

asked by lee on November 14, 2012
9. ### Math help please check

Add or Subtract for #3-4 3. (2x2 + 6x + 1) + (–7x2 + 2x – 3) 5x2 – 4x – 2 –5x2 + 8x – 2 5x2 – 8x + 2 –9x2 – 8x + 2 4. (3x2 – 7x – 4) – (6x2 – 6x + 1) –3x2 – x –5 –3x2 –13x + 5 9x2 – x + 5 3x2

asked by Delilah on May 6, 2013
10. ### Algebra

Solve: 5x-3=11+12x; 17x-3=11; 17x-3+3=11+3= 17x=14; x= 14/17 is this right?

asked by A.W. on February 1, 2009

More Similar Questions