[tex]-3a^4b^2*5a^3b^5=(-3*5)a^{4+3}b^{2+5}=-15a^7b^7. [/tex]
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[tex]-3a^4b^2*5a^3b^5=(-3*5)a^{4+3}b^{2+5}=-15a^7b^7. [/tex]