ALGEBRA HELP PLEASE ANYONE?

Hello, I was just wondering if you'll could give me some help on my Algebra here. Some of them I know the answer to but not to sure if I am right. Could I please get some feedback

2-5x=x+6 my answer x=-1

6x^2 * 7x^3 my answer 42x^5

2x^2-x-15 my answer (x-3) (2x+5)

x^2 + 4x+1=0 my answer (x+2) (x+2)

z^2- 8z=9 my answer no solution

4^- 3 my answer 1/12

–2x < 14 for x my answer x < –7

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  • 1 decade ago
    Best Answer

    2-5x=x+6

    Add 5x to both sides

    2=6x+6

    Subtract 6 from both sides

    -4=6x

    Divide x by 6

    -4/6=x

    Simplify

    x=-2/3

    42x^5 is correct

    (x-3)(2x+5) is correct

    x^2+4x+1 has no real roots. You can't factor it

    z^2-8z-9=0

    (z-9)(z+1)

    z=9 or z=-1

    4^(-3) means 1/(4^3), which is 1/(4*4*4), which is 1/64

    When you divide both sides of an inequality by a negative number, you have to flip the inequality direction

    -2x<14 becomes

    x>-7

    _/

  • 1 decade ago

    number 1. is wrong...the answer is x= -2/3

    number 2. is right!

    number 3. is right!

    number 4. is wrong use the quadriatic formula to solve.

    number 5. is (x-9) (x+1) {You are suppose to bring the 9 over to the other side and solve it from there. If they want you to solve for x than the answer is x=9 x= -1}

    number 6. is 1/64

    number 7. is x> -7 {When you divide by a negative you switch the greater of less than sign}

  • 1 decade ago

    Number 1 is wrong.

    2 - 5x = x + 6

    - 5x = x + 4 <--Subtracted the two from the left side.

    - 6x = 4 <--Subtracted the x from the right side.

    x = -4/6 <--fraction

    x = -2/3 <--simplified

    Number 6 is wrong.

    4^-3 is 64. It's not negative because when it is squared, it turns negative (Pos * Neg = Neg). Then when it is put to the NEXT power it turns positive (Neg * Neg = Pos).

    Other than that I'm pretty sure that you're right. glhfddkads

  • 1 decade ago

    Sorry but It's been so long that I don't remember how to do most of these but on the 1st one, it should look like:

    2-5x=x+6

    -5x-x=6-2 <- When you change sides be sure you change signs

    -6x=4

    -6x/-6=4/-6 <- divide both sides by -6

    x=4/-6 which reduces to x=-2/3

    And on -2x < 14, your answer is correct.

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  • WHAT GRADE ARE YOU IN?

    && I CAN'T EVEN DO MY OWN ALGEBRA!

    BUT MY SISTER SAYS SO FAR THE FIRST THREE ARE RIGHT!

    BUT ALL REST WE DIDN'T CHECK MY SISTER IS STUDYING TO BE A HIGH SCHOOL PROFESSOR OR WHAT EVER BUT YEA SO WHAT GRADE ARE YOU IN??

  • 1 decade ago

    correct and just to make sure use a calculator

  • 1 decade ago

    Number one is wrong.

  • 1 decade ago

    You do realize that there are things called "calculators"..right?

  • Anonymous
    1 decade ago

    you are right !

  • 1 decade ago

    u need to multiply the nazi by hitler, which gives you jew.

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