SmokeyRN SmokeyRN
  • 21-03-2018
  • Mathematics
contestada

A f(x)=2x2+4x-16
B f(x) =3x2-5x+16
C f(x) =5x2-2x-16
D f(x) =-4x2+3x+16

A fx2x24x16 B fx 3x25x16 C fx 5x22x16 D fx 4x23x16 class=

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thebestgamer172
thebestgamer172 thebestgamer172
  • 21-03-2018
I would have to go with (B.)
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sqdancefan
sqdancefan sqdancefan
  • 21-03-2018
The graph's y-intercept is -16, so only A and C are viable answers. The axis of symmetry is x=-1, so only selection A is appropriate.

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The axis of symmetry of ax^2 +bx +c is x=-b/(2a). For selection A, that is -4/(2*2) = -1. For selection C, that is -(-2)/(2*5) = 1/5, wrong in sign and in magnitude.
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