Thursday

October 23, 2014

October 23, 2014

Posted by **John** on Tuesday, October 30, 2007 at 1:18pm.

1. Factor Completely

7x^2 + 49x + 42

I get 7x^2 + 7x + 42x + 42

then 7x(x+1) but the right side is confusing me. I know it should be (x+6).

So the answer is 7x(x+1)(x+6) But I get 7x(x+1) 7(6x+6). What am I doing wrong?

2.Factor completley:

x^10y^3 - 4x^9y^2 - 21x^8y

Totally consfused on this one.

- Algebra -
**bobpursley**, Tuesday, October 30, 2007 at 1:31pmOn the first, factor 42 out of the second paren.

7x(x+1)+ 42(x+1)

(x+1)(7x+42)

now factor 7 out of the second..

7(x+1)(x+6)

Onthe last, factor the common factor x^8*y out

yx^8[(xy)^2 -4xy -21]

The last term factors to (xy-7)(xy+3)

- Algebra -
**Neo**, Tuesday, October 30, 2007 at 1:33pmSolution for No.1

7x^2 + 49x + 42

7x^2 + 7x + 42x + 42

(7x^2 + 7x) + (42x + 42)

[7x(x+1)+ 42(x+1)]

(7x+42)(x+1)

7(x+6)(x+1)

Solution for No.2

x^10y^3 - 4x^9y^2 - 21x^8y

x^8y (x^2y^2 - 4xy - 21)

x^8y (xy-7)(xy+3)

**Answer this Question**

**Related Questions**

algebra - I need to factor (my last post was incorrect) 24x^2 + 42x + 15

Pre Calculus - factor completely 1. x^3-9x^2 2. 36x^6-49x^4

Algebra - Andrew factored the expression 28x^3-42x^2+35x as 7x(4x^2+6x-5). But ...

math - I need help with these two problems please. Completely factor the ...

Algebra 1 - factor out the greatest common factor. 7x^4-49x^3+14x^2=7x^2 Is this...

Quick math help - Can someone please check my math Hw? Thank you!! Solve each ...

Algebra 2 - what is the opposite of 49x^2y A. 49x^-2y b. -49x^2y c. 1/49x^2y d...

Algebra HELP! - 6(7x - 5) = - 114 HELP!!!! distribute the 6 to the 7x and 5. ...

mat117/algebra - factor each polynomial completely. to begin, state which method...

algebra - Factor 24^2 + 42x + 15