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April 18, 2015

April 18, 2015

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.

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