Question

7(4х-3)-5(8-2х) при х=-6,2

Answer 1

28х - 21 - (40 - 10х) = 28х - 21 - 40 + 10х = 38х - 61
При х = - 6,2
38х - 61 = 38 * (- 6,2) - 61 = - 235,6 - 61 = - 296,6

Answer 2

7(4х-3)-5(8-2х)

28х-21-40+10х

38х-61

38×(-6,2)-61

-235,6-61= -296,6

Answer 3

To find the value of the expression 7(4x-3) - 5(8-2x) when x = -6.2, we can substitute the value of x into the expression and simplify the calculations.

Let's start by substituting x = -6.2 into the expression:

7(4(-6.2) - 3) - 5(8 - 2(-6.2))

First, let's simplify the expression inside the parentheses:

7(-24.8 - 3) - 5(8 + 12.4)

Next, let's perform the calculations inside the parentheses:

7(-27.8) - 5(20.4)

Now, let's calculate the multiplications:

-194.6 - 102

Finally, let's perform the subtraction:

-296.6

Therefore, when x = -6.2, the value of the expression 7(4x-3) - 5(8-2x) is -296.6.