Question

Prove for any value of y the value of expression y^4−(y^2−9)(y^2+9) is divisible by 9.

Answer 1

Answer:

Step-by-step explanation:

y4−

(y2−9)(y2+9)

9

Distribute:

=y4+

−1

9

y4+9

Combine Like Terms:

=y4+

−1

9

y4+9

=(y4+

−1

9

y4)+(9)

=

8

9

y4+9

Answer:

=

8

9

y4+9

Answer 2

Answer:

Its 9*9

Step-by-step explanation:

The equation equals 81 and 9*9  equals 81.

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