Work Step by Step
The square of a binomial sum is: $(A+B)^2=A^2+2AB+B^2$. The square of a binomial difference is: $(A-B)^2=A^2-2AB+B^2$. Hence here: $(5x-3y)^2=(5x)^2-2\cdot5x\cdot3y+(3y)^2=25x^2-30xy+9y^2$
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