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pishuonlain [190]
4 years ago
14

(2x9y^n)(4x2y10)=8x11y20

Mathematics
1 answer:
8090 [49]4 years ago
5 0
(2x^9y^n)(4x^2y^{10})=8x^{11}y^{20}\\\\(2\cdot4)(x^9\cdot x^2)(y^n\cdot y^{10})=8x^{11}y^{20}\\\\8x^{9+2}y^{n+10}=8x^{11}y^{20}\\\\8x^{11}y^{n+10}=8x^{11}y^{20}\Rightarrow n+10=20\ \ \ |-10\\\\\boxed{n=10}

\text{Used:}\\a^n\cdot a^m=a^{n+m}
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