a(3a-5)= -3(3*(-3)-5)= -3(-9-5)= -3*(-14) = 42
-5x+3x²-9x+15x= 3x²+x
3a³-15ab-12b³
No1. 3a^2-5a=3×(-3^2)-5(-3)=3×9+15=27+15=42. No2. 1) -5x+3x^2-9x+15x=-14x+3x^2+15x=3x^2+x.
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a(3a-5)= -3(3*(-3)-5)= -3(-9-5)= -3*(-14) = 42
-5x+3x²-9x+15x= 3x²+x
3a³-15ab-12b³
No1. 3a^2-5a=3×(-3^2)-5(-3)=3×9+15=27+15=42. No2. 1) -5x+3x^2-9x+15x=-14x+3x^2+15x=3x^2+x.