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deleted.

 Jun 9, 2019
edited by sinclairdragon428  Jun 9, 2019
edited by sinclairdragon428  Jun 9, 2019
edited by sinclairdragon428  Jun 9, 2019
edited by sinclairdragon428  Nov 20, 2019
 #1
avatar+107011 
+3

1.

Solve for x, where x>0 and 0=-9x^2-3x+2 Express your answer as a simplified common fraction.

 

Multiply through by - 1  and we have

 

9x^2 + 3x - 2  = 0

 

(3x + 2) (3x - 1)  = 0

 

Only the second factor produces a positive solution of  1/3

 

 

cool cool cool

 Jun 9, 2019
 #2
avatar+107011 
+3

2.

For how many positive integers x is x^2+4x+4 between 10 and 50?

 

Note   x^2 + 4x + 4  =  (x + 2)^2

 

Whe x = 1        (x + 2)^2  = 9 

When x = 2      (x + 2)^2  =  16

When x = 5       (x + 2)^2 = 49

When x = 6       (x + 2)^2   =  64

 

So....  four integers....2, 3 , 4 , 5

 

 

cool cool cool

 Jun 9, 2019

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