Question

find zero f(x) =2x-3=9​

Answer 1

Answer:

2x-3=9

2x=9-3

2x=6

x=6/2

x=3...

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Answer 2

Answer:

This cubic has zeros

−

2

and

1

4

(

−

5

±

√

57

)

Explanation:

f

(

x

)

=

2

x

3

+

9

x

2

+

6

x

−

8

By the rational roots theorem, any rational zeros of

f

(

x

)

are expressible in the form

p

q

for integers

p

,

q

with

p

a divisor of the constant term

−

8

and

q

a divisor of the coefficient

2

of the leading term.

That means that the only possible rational zeros are: