Question

Write the coefficient of x² in each of the following .
(a)(a-1)(3a-4)
(b)(2-x)(2+x)​

Answer 1

Answer:

(a) Coefficient of a² = 3

(b) Coefficient of x² = -1

Step-by-step explanation:

(a)  (a - 1)(3a - 4)

     a(3a - 4) - 1(3a - 4)

     3a² - 4a - 3a + 4

     3a² - 7a + 4

Here, the coefficient of a² is 3.

(b)  (2 - x)(2 + x)

     By using identity: (a+b)(a-b) = a² - b²

      a = 2, b = x

      (2 - x)(2 + x) = 2² - x²

                           = 4 - x²

Here, the coefficient of x² is -1.

Hope it helps...