# Algebra.

posted by .

Help?
-Solve Polynomial Equations By factoring.

1. x^6-25x^4=0

2. y^3-3y^2=16y-48

3. x^3+2x^2-9x-18=0

4. x^3+x^2-4x-4=0

5. x^3-7x^2=-5x-30

6. a^4+2a^3+a^2=0

7. 3n^4-4n^2=-1

8. 8x^5+10x^4=4x^3+5x^2

9. 2n^4-9n^2+4=0

10. 8y^4 / y^2 - 4y^2 / y^2 =0

• Algebra. -

1. x^4(x^2 - 25) = 0
x^4(x+5)(x-5) = 0
x=0 or x=-5 or x=5

2. x^3 - 3y^2 - 16y + 48=0
use grouping
y^2(y-3) - 16(y - 3) = 0
(y-3)(y^2 - 16) = 0
(y-3)(y+4)(y-4) = 0
y = 3 or y = -4 or y = 4

3, 4 done the same way

5. x^3 - 7x^2 + 5x + 30 = 0
--- now simple or easy solution, are you you typed it correctly?

6. take out common factor of a^2, then it becomes easy

7 .
3x^4 - 4n^2 + 1 = 0
let n^2 = x, we get
3x^2 - 4x + 1 = 0
(3x - 1)(x - 1) = 0
x = 1/3 or x = 1
then n^2 = 1/3 or n^2 = 1
n = 1/±√3 or n = ± 1

8. move everbody to the left, then factor

9. similar to #7

10 8y^4 / y^2 - 4y^2 / y^2 =0
8y^2 - 4 = 0
divide by 4
2y^2 - 1 = 0
y^2 = 1/2
y = ± 1/√2

• typo - Algebra. -

#5 should say:

--- not a simple or easy solution, are you you typed it correctly?

• Algebra. -

Sorry No Didn't .
It should have been -35

• Algebra. -

Can You explain how to do 3?
i know it's like 2, but then if i factor everything out there's nothing left to make my two equations right?!

## Similar Questions

1. ### Algebra

Can someone please help solve this? Solve by using addition or substitution or addition. 10x+2y=7 y=-5x+3 the answer my got was x=11/10 y=-2 My teacher said that was wrong. Never mind this post I found out how to solve it. Try substitution.
2. ### math

solve each of the following equations by factoring and show your work 12x² + 15x + 10= -10x -2

Rewrite each polynomial as the product of two binomials. 1. y^2 + 6y + 9 2. 25x^2 - 10x + 1 3. 36 - y^2 Can someone please help me do these correctly?
4. ### algebra2

whata the correct anwser for x^6 - 25x^4=0 Ps. this is polynomial factoring ...
5. ### Algebra.

Help? -Solve Polynomial Equations By factoring. 1. x^6-25x^4=0 2. y^3-3y^2=16y-48 3. x^3+2x^2-9x-18=0 4. x^3+x^2-4x-4=0 5. x^3-7x^2=-5x-30 6. a^4+2a^3+a^2=0 7. 3n^4-4n^2=-1 8. 8x^5+10x^4=4x^3+5x^2 9. 2n^4-9n^2+4=0 10. 8y^4 - 4y^2 =0
6. ### Math - PreCalc (12th Grade)

Which rectangular equation corresponds to these parametric equations?
7. ### algebra

Gina wrote this system of linear equations: 2x + y = 7 4x + 5y = 11 Which of the following shows the first four steps that Gina could have used to correctly solve this system for x?
8. ### RE: ALGEBRA

Given 25x^2 - 10x = 0, which values of x will satisfy the equation?
9. ### Algebra

Factor quadratic expressions: 2x^2 + 9x + 4 10x^2 + 70x + 100 Solve quadratic equations by factoring: 2x^2 + 9x + 4 = 0 Solve by taking square roots: (x - 5)^2 - 81 = 0
10. ### Mat221

Factoring with two variables Factor each polynomial X^2-25x+150

More Similar Questions