Question

5. If a² + 1 a² 1 = 18, find the value of: (i) a +1/a

Answer 1

Answer:

Correct option is

C

±4

a

2

+

a

2

1

​

=18

We know,

(a−

a

1

​

)

2

=a

2

−2(a)(

a

1

​

)+(

a

1

​

)

2

=>(a−

a

1

​

)

2

=18−2

=>(a−

a

1

​

)

2

=16

=>(a−

a

1

​

)=±

16

​

=>(a−

a

1

​

)=±4

Step-by-step explanation:

i have no idea why it wrote like that but hope it helps at some point