Question

(2+с)²-с(с-4) при с =-1÷8

Answer 1

(2+c)²-c(c-4) = (15/8)²+1/8*(-33/8) = 225/64 + (-33/64) = 192/64 = 3

Answer 2

To evaluate the expression (2+с)²-с(с-4) at с = -1/8, we substitute с with -1/8 in the expression and perform the calculations.

(2+с)² - с(с-4)

Substituting с = -1/8:

(2 + (-1/8))² - (-1/8)((-1/8) - 4)

Simplifying the expression inside the parentheses:

(2 - 1/8)² - (-1/8)(-33/8)

Calculating the values inside the parentheses:

(15/8)² - (33/64)

Squaring (15/8):

225/64 - (33/64)

Combining the fractions:

(225 - 33)/64

Calculating the numerator:

192/64

Reducing the fraction:

3

Therefore, when с = -1/8, the expression (2+с)²-с(с-4) evaluates to 3.