Simplify:-

(-3x^2 )(4xy^2(-2/3x^2)

(9x^2)(16x^2y^2)(4/9x^2)

(144x^4y^2)(4/9x^2)

576x^4y^2/9x^2

64x^2y^2

verify the result for the given values (-3x^2 )(4xy^2(-2/3x^2) for x=3/4 and y=3:-

u already know that all of this (-3x^2 )(4xy^2(-2/3x^2) is this 64x^2y^2

so now all u have to do is replace

64(3/4)^2(3)^2

64(0.5625)(9)

The answer is 324