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September 23, 2014

September 23, 2014

Posted by **Megan Bill** on Sunday, December 12, 2010 at 5:06pm.

3(2y-4)=9-3(y+1)The answer is 2. How do you work it out to get the answer?

(x+5)(x-3)=9 the answer is -6,4

How do you work it out????

- Math -
**Reiny**, Sunday, December 12, 2010 at 5:12pmfirst one:

3(2y-4)=9-3(y+1)

6y - 12 = 9 - 3y - 3

6y + 3y = 6+12

9y = 18

y = 2

2nd:

(x+5)(x-3)=9

x^2 - 3x + 5x - 15 = 9

x^2 + 2x - 24 = 0

(x+6)(x-4) = 0

so x+6 = 0 or x-4 = 0

x = -6 or x = 4

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