Question

expand ( 3 X + 7)³. What is the coefficient of x in the expression​

Answer 1

Step-by-step explanation:

Using the formula,

Therefore, coefficient of is 27 I don't know formula but I know answer answer is 27 because by using the formula a b square equal

Answer 2

Answer:

• ( 3 x + 7)³   $= 27x^2 + 189x^2 + 441x + 343$
• The coefficient of x in the expression is 441.

Step-by-step explanation:

Formula: $(a + b)^3 = a^3 + 3a^2b + 3ab^2 + b^3$

Now expand ( 3 X + 7)³

$= (3x)^3 + 3(3x)^2 (7) + 3(3x) (7)^2 + (7)^3\\= 27x^3 + 3(9x^2) (7) + 9x (49) + 343\\= 27x^2 + 21(9x^2) + 441x + 343\\= 27x^2 + 189x^2 + 441x + 343$

So, ( 3 x + 7)³  $= 27x^2 + 189x^2 + 441x + 343$

And the coefficient of x in the expression is 441.