1) (3x-)=3(-2)x^2.^4=6x^8
2) 4a^2*3a^5=(4+3)a^2+^5=7a^7
3) x^6.x. x^3=x^6+^3=x^9
4) 3^4.2^3+6^4=3

correct the errors! and describe what is wrong there are exponents( 4^)

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