find the product of coefficient of x³ and coefficient of 'x' in the expression 3x+4x²-7x³
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x^3=7
×=3 is the coefficients of these
-7×3=-21
×=3 is the coefficients of these
-7×3=-21
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coefficient of x^3=-7
coefficient of x=3
product=3×-7
=-21
coefficient of x=3
product=3×-7
=-21
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