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RainbowPanda  Apr 18, 2018
 #1
avatar+88871 
+2

37

x^2 - 16 x  + 64

It will touch the x axis  when y  = 0

So

x^2  - 16x  + 64  = 0     factor

(x - 8)^2  =  0      take the square root of both sides

x - 8  = 0

x  =  8

 

38

8x*2 + 10x  - 2   = 0

 

x  =   ( -10 ±√ [ 10^2  - 4(8)(-2) ]  ) /  [ 2*8 ]

x  =  ( -10±√ [ 100 + 64])  / (16)

x  = (-10 ±√164) / 16

x  =  (-10 + √164 ) / 16

x = 0.18

 

 

 

cool cool cool

CPhill  Apr 18, 2018

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