1.

3y2=15y by formula method

Answer»

We have,

\qquad \: \: 3 {y}^{2} = 15y \\ \\ \implies 3 {y}^{2} - 15y = 0 \\ \\ \implies 3y(y - 5) = 0 \\ \\ \implies 3y = 0 \: \boxed{or} \: y - 5 = 0 \\ \\ \implies y = 0 \: \: \: \boxed{or} \: y = 5


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