Question

A Find the coefficient of ×2 and the x in the product of ( x_ 3 ) ( x+7) (x_4)​

Answer 1

Answer:

Step-by-step explanation:

Given,

(x - 3)(x + 7)(x - 4)

To Find :-

value of coefficient of x^2

Solution :-

Let us multiply the terms :- (x - 3)(x + 7)(x - 4)

[x(x + 7) -3(x +  7)](x - 4)

[x^2 + 7x - 3x - 21](x - 4)

(x^2 + 4x - 21)(x - 4)

x(x^2 + 4x - 21) -4(x^2 + 4x - 21)

x^3 + 4x^2 - 21x - 4x^2 - 16x + 84

x^3 - 37x + 84x

As there is no x^2 term. Since, no coefficient of x^2 term or we can say coefficient as zero