Anushree
Anushree Anushree
  • 01-04-2018
  • Mathematics
contestada

How do you do this? I am so stuck!

How do you do this I am so stuck class=

Respuesta :

mkryukova19 mkryukova19
  • 01-04-2018
x⁴+ax³+ax²+11x+b=0    

for x=3
3⁴+a*3³+9a +11*3+b=0
81+27a+9a +33+b=0
36a+b+114=0

for x=-2
(-2)⁴+a*(-2)³+(-2)²a+11*(-2)+b=0
16-8a+4a-22+b=0
-4a+b-6=0

system
36a+b+114=0
-4a+b-6=0

subtract second equation from first
36a+b+114+4a-b+6=0
40a+120=0
40a=-120
a=-3,
-4a+b-6=0, -4*(-3)+b-6=0,  12-6+b=0, b=-6
Answer Link
kissimmisewilsp6glpl
kissimmisewilsp6glpl kissimmisewilsp6glpl
  • 01-04-2018
If you watch YouTube it would better break it down for u
Answer Link

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