Its (3x4y-2)(5x2y7) 3x to the 4 power times y to the -2 power times 5x to the 2 power times y to the 7 power?

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(3x^4y^-2)(5x^2y^7)

=3*5x^2*x^4*y^-2*y^7

= 15 x^(2+4)y^(-2+7) (because a^m*a^n = a^(m+n) )

= 15 x^6 y^5..................................ANSWER

answer is

15 x^6 y^5 ( that is 15 *x power 6*y power 5)

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