Question

If x square -1 is a factor of ax cube + bx square +cx +d show that a+c =0

Answer 1

Answer:

x²-1=0

x²=1

x=√1

x=±1

x=1 or x=-1

p(x)=ax³+bx²+cx+d

p(-1)=a(-1)³+b(-1)²+c(-1)+d

a(-1)+b(1)-c+d=0

-a+b-c+d=0

b+d=a+c

Answer 2

Answer:

a+c = 0

i hope it helps you..

see this image and understand it...

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