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http://prntscr.com/mhpa7u

 

i need help with 15 and 16 

 

here 

http://prntscr.com/mhpaep

 Feb 7, 2019
 #1
avatar+98129 
+1

OK....we have

 

x^2 -4x -32

 

15.   To find the x intercepts  set the above to 0  and factor

 

x^2 - 4x - 32 = 0

 

(x - 8) ( x + 4) = 0

 

Setting each factor to 0 and solving for  x we have that

 

x - 8 = 0               and       x + 4 = 0

x = 8                                  x = -4

 

So...the x intercepts (roots) are x = 8 and x = -8

 

 

16.    the discriminant is

 

(-4)^2 -  4 (1) (-32)

 

16 + 128

 

144

 

When the discriminant is > 0.....we will have two real roots

 

 

cool cool cool

 Feb 7, 2019
 #2
avatar
+1

THANK YOU 

 Feb 7, 2019

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