Unknown coefficients

Question

The coefficient of x^2 is 4. Find the value of K, and hence find the coefficient of x.

(x-3)(x^2+kx-2)

Answer 1

Multiplying out

x³ - 3x² + kx² - 2x - 3kx + 6

x³ + (k - 3)x² - (2 + 3k)x +6

k - 3 = 4

What is the value of k?