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2900-108y+y^{2}=\left(50+y\right)^{2}
Use the distributive property to multiply 58-y by 50-y and combine like terms.
2900-108y+y^{2}=2500+100y+y^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(50+y\right)^{2}.
2900-108y+y^{2}-100y=2500+y^{2}
Subtract 100y from both sides.
2900-208y+y^{2}=2500+y^{2}
Combine -108y and -100y to get -208y.
2900-208y+y^{2}-y^{2}=2500
Subtract y^{2} from both sides.
2900-208y=2500
Combine y^{2} and -y^{2} to get 0.
-208y=2500-2900
Subtract 2900 from both sides.
-208y=-400
Subtract 2900 from 2500 to get -400.
y=\frac{-400}{-208}
Divide both sides by -208.
y=\frac{25}{13}
Reduce the fraction \frac{-400}{-208} to lowest terms by extracting and canceling out -16.