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16-8y+y^{2}+3^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4-y\right)^{2}.
16-8y+y^{2}+9
Calculate 3 to the power of 2 and get 9.
25-8y+y^{2}
Add 16 and 9 to get 25.
16-8y+y^{2}+3^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4-y\right)^{2}.
16-8y+y^{2}+9
Calculate 3 to the power of 2 and get 9.
25-8y+y^{2}
Add 16 and 9 to get 25.