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-16y^{2}-1
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-16y^{2}-1
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3^{2}y^{2}-1^{2}-\left(5y\right)^{2}
Expand \left(3y\right)^{2}.
9y^{2}-1^{2}-\left(5y\right)^{2}
Calculate 3 to the power of 2 and get 9.
9y^{2}-1-\left(5y\right)^{2}
Calculate 1 to the power of 2 and get 1.
9y^{2}-1-5^{2}y^{2}
Expand \left(5y\right)^{2}.
9y^{2}-1-25y^{2}
Calculate 5 to the power of 2 and get 25.
-16y^{2}-1
Combine 9y^{2} and -25y^{2} to get -16y^{2}.
3^{2}y^{2}-1^{2}-\left(5y\right)^{2}
Expand \left(3y\right)^{2}.
9y^{2}-1^{2}-\left(5y\right)^{2}
Calculate 3 to the power of 2 and get 9.
9y^{2}-1-\left(5y\right)^{2}
Calculate 1 to the power of 2 and get 1.
9y^{2}-1-5^{2}y^{2}
Expand \left(5y\right)^{2}.
9y^{2}-1-25y^{2}
Calculate 5 to the power of 2 and get 25.
-16y^{2}-1
Combine 9y^{2} and -25y^{2} to get -16y^{2}.
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