2.what should be added to 7x^3+8x²-11x+9 to get 6x^3-9x²+15x-3?
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Answer:
-x^3-17x^2+26x-12
Step-by-step explanation:
Lets call the expression to be added as E, then:
7x^3+8x²-11x+9 + E= 6x^3-9x²+15x-3
E= 6x^3-9x²+15x-3-(7x^3+8x²-11x+9)=
=6x^3-9x²+15x-3-7x^3-8x²+11x-9=
=-x^3-17x^2+26x-12
E=-x^3-17x^2+26x-12
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