Wednesday

September 17, 2014

September 17, 2014

Posted by **Amy** on Wednesday, May 27, 2009 at 6:26am.

17. Solve the equation using the zero product property...

-8n(5n+3)

19. Solve the equation by factoring

5z^2-2z-3=0

20. Solve the equation by completing the square..

x^-3x=4

Thank you.. Please show me how you did it if possible.

- Math -
**Reiny**, Wednesday, May 27, 2009 at 7:47amin #1 you probably meant

-8n(5n+3) = 0

When you have the product of two or more factors equal to zero and the result is zero, that can only happen if any one of the factors equal to zero.

so-8n = 0, then n = 0

or

5n+3 = 0,

5n=-3

n=-3/5

#2

5z^2-2z-3=0

(5z + 3)(z - 1) = 0

then 5z+3 = 0 or z-1 = 0

z = -3/5 or z=1

#3 did you mean

x^2-3x=4 ?

take 1/2 of the middle term coefficient, square it, then add to both sides

1/2 of -3 is -3/2, square that gives you 9/4

x^2 - 3x + 9/4 = 4 + 9/4

(x-3/2)^2 = 25/4

x - 3/2 = +- 5/2

x = 3/2 +- 5/2

x = 4 or -1

- Math -
**Reiny**, Wednesday, May 27, 2009 at 9:19amin my solution to #2

the (5z + 3)(z - 1) = 0

should have been

(5z - 3)(z + 1) = 0

Please make the necessary corrections in my solution, sorry about the slip.

**Answer this Question**

**Related Questions**

math - I need help with these three problems. They are on a Study Guide and I ...

Math - I need help with these three problems. They are on a Study Guide and I ...

Math - I need help to set the equation up to solve a system to ensure that I get...

math question - How do i solve a problem like this? I took a study guide and i ...

Math - The following are the last two problems on my test review. I am trying to...

science - I need some help with my science homework. Well it is not really my ...

science - I need some help with my science homework. Well it is not really my ...

Math - I need help with how to do these problems.. SOLVE THE EQUATION USING THE ...

TRIGONOMETRY - Can you please help me with this question on my study guide for ...

Biology - I need help with a few questions involving my study guide for my exam...