Question

2) 49c2 - 9/ 49c2 + 42с +9 при c = -4.

Answer 1

Ответ:

1,24

Объяснение:

(49c^2-9) / (49c^2+42c+9)   =   (7c-3)(7c+3)  / (7c+3)^2=  ( 7c-3)/(7c+3)

(7c-3)/(7c+3)      pri c=-4

(7(-4)-3) /  (7(-4)+3) =(-28-3) / (-28+3) =- 31/-25=1 6/25 = 1,24

Answer 2

To evaluate the given expression, substitute the value of c with -4 and perform the calculations step by step:

Given expression:

$\frac{49c^2 - 9}{49c^2 + 42c + 9}$

Substitute $c = -4$:

$\frac{49(-4)^2 - 9}{49(-4)^2 + 42(-4) + 9}$

Now calculate the values:

$\frac{49 \cdot 16 - 9}{49 \cdot 16 + (-168) + 9}$

$\frac{784 - 9}{784 - 168 + 9}$

$\frac{775}{625}$

Simplify the fraction:

$\frac{31}{25}$

So, when $c = -4$, the value of the expression is $\frac{31}{25}$.