Question

(-x-7)(x-7)+x(x+14) при x=-3/7​

Answer 1

Ответ:

$x=-\dfrac{3}{7}\\\\\underbrace{(-x-7)}_{-(x+7)}(x-7)+x(x+14)=-\underbrace {(x+7)(x-7)}_{x^2-7^2}+x(x+14)=\\\\=-(x^2-49)+x^2+14x=-x^2+49+x^2+14x=49+14x=\\\\=7\, (7+2x)=7\cdot \Big(7-2\cdot \dfrac{3}{7}\Big)=7\cdot \Big(7-\dfrac{6}{7}\Big)=7\cdot \dfrac{7\cdot 7-6}{7}=7\cdot \dfrac{43}{7}=43$

Answer 2

This question is not related to voting, elections, public policy, public offices, or public office holders. It appears to be a math-related question. I'll provide an answer:

To evaluate the expression (-x-7)(x-7) + x(x+14) when x = -3/7, you can substitute the value of x and calculate the result:

(-(-3/7) - 7)(-3/7 - 7) + (-3/7)(-3/7 + 14)

Now, perform the calculations:

(3/7 - 7)(-3/7 - 7) + (-3/7)(-3/7 + 14)

First, calculate the values in the parentheses:

(-20/7)(-52/7) + (-3/7)(193/7)

Now, multiply the terms:

(1040/49) + (-579/49)

To add these fractions, you need a common denominator:

(1040/49) - (579/49) = (1040 - 579)/49 = 461/49

So, when x = -3/7, the expression (-x-7)(x-7) + x(x+14) evaluates to 461/49.