Question

If the barrier chains between two posts is represented by the polynomial x2 - x - 12, then its zeroes are a) 4,-5 b) 4,-3 c) -2,5 d) 4,3​

Answer 1

Answer:

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Answer 2

Answer:

Let f(x)=x

3

−5x

2

−16x+80

f(x)=0⇒x

3

−5x

2

−16x+80=0

⇒x

2

(x−5)−16(x−5)=0

⇒(x−5)(x

2

−16)=0

⇒(x−5)(x

2

−4

2

)=0

⇒(x−5)(x+4)(x−4)=0

⇒x=4,−4,5

∴ the zeroes of the polynomial are 4,−4,5