Question

find the zeros of the cubic polynomial
$2 {x}^{3} + {x}^{2} - 5x + 2$
If two of its zeros are 1 and -2​

Answer 1

Answer:

2(1³)+(1²)-5(1)+2

2+1-5+2

5-5

=0

for x=-2

2(-2³)+(-2²)-5(-2)+2

2(-8 ) + 4 + 10 + 2

-16+16

=0

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