( ?)(8y^2−4y^4)=40y^4−20y^6 Solve for ?

To solve for ?, we can set the two expressions equal to each other and then solve for ?:

( ?)(8y^2−4y^4) = 40y^4−20y^6

Expand the left side by distributing the ? to each term inside the parentheses:

? * 8y^2 - ? * 4y^4 = 40y^4 - 20y^6

Now, we set the two sides equal to each other:

8?y^2 - 4?y^4 = 40y^4 - 20y^6

Next, combine like terms:

8?y^2 - 4?y^4 = -20y^6

Now we want to isolate the ? variable. We can factor out a ? from the left side:

? (8y^2 - 4y^4) = -20y^6

Divide both sides by (8y^2 - 4y^4):

? = -20y^6 / (8y^2 - 4y^4)

Further simplification is not possible without knowing the actual values of y.