Question

If y + 1/4y = 2 then value of 16y3 + 1/4y3 is:​

Answer 1

Answer:

Correct option is

D

8y

(16y

2

−1)+(1−4y)

2

=16y

2

−1+1+16y

2

−8y

=32y

2

−8y

=8y(4y−1)

So, 8y is a factor.

Hence, D is correct option

Answer 2

Answer:

y + 1/4y = 2

5/4y = 2

y = 8/5

now 16y³+1/4y³ =. 16(8/5)³ + 1/4 (8/5)³

= (8/5)³ (16+1/4)

= (8/5)³ 65/5

=(8/5)³× 13

= 6656/125

16y³+ 1/4y³ =53.248