find the missing value

(?) (7y^5 - 3y) = 35y^14 - 15y^10

1 answer

The missing value is 5y^9.

(5y^9) (7y^5 - 3y) = 35y^14 - 15y^10

Expanding the left side:

35y^14 - 15y^10 = 35y^14 - 15y^10

So, the missing value is 5y^9.