b) \(\left(6x^2+\dfrac{1}{3}\right)^2=36x^4+4x^2+\dfrac{1}{9}\)
c) \(\left(5x-4y\right)^2=25x^2-40xy+16y^2\)
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b. \(\left(6x^2+\dfrac{1}{3}\right)^2=36x^4+4x^2+\dfrac{1}{9}=\left(6x^2\right)^2+\left(2x\right)^2+\dfrac{1}{9}\)
c. \(\left(5x-4y\right)^2=25x^2-40xy+16y^2\)
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