sophieet
sophieet sophieet
  • 21-01-2018
  • Mathematics
contestada

show that if y=x^2 + 8x - 3 then y> -19 for all values of x

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dannielle
dannielle dannielle
  • 21-01-2018
x^2+8x-3>-19     | +19
x^2+8x+16>0 

x^2+4x+4x+16>0
x(x+4)+4(x+4)>0
(x+4)(x+4)^2>0
 this is true cause (X+4)^2 >0  cause X+4>0
Answer Link
Аноним Аноним
  • 21-01-2018
x^2+8x-3>-19        l+19
x^2+8x+16<0

x^2+4x+4x+16<0
x(x+4)+4(x+4)>0
(x+4)(x+4)^2>0
please my answer!!!!
Answer Link

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