Question

find the coefficient of x^3 in 3x-4(x^2-5x-1)

Answer 1

$3x - 4(x {}^{2} - 5x - 1) \\ = 3x {}^{3} - 15x {}^{2} - 3x - 4x {}^{2} + 20x + 4 \\ = 3x {}^{3} - 19x {}^{2} + 17x + 4$
Coefficient of x^3 in this polynomial is 3.

Answer 2

Answer:

Step-by-step explanation:

(3x-4)(x^2+5x-1)

=3x^3+15x^2-3x-4x^2-20x+4

=3x^3+12x^2-23x+4

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