Question

3(8а-20)-5(1,4а-9) а= -2

Answer 1

Ответ:

3*(8a - 20) - 5*(1,4a - 9 ) при a = -2

сначала раскроем скобки

24a - 60 - 7a + 45 = 17a - 15

теперь подставляем -2

17 * (-2) - 15 = - 34 - 15 = - 49

Answer 2

To solve this expression for a = -2, you'll substitute -2 for 'a' and then simplify:

3(8a - 20) - 5(1.4a - 9) where a = -2

Now, replace 'a' with -2:

3(8(-2) - 20) - 5(1.4(-2) - 9)

Now, calculate the values within the parentheses:

3(-16 - 20) - 5(-2.8 - 9)

Now, continue to simplify:

3(-36) - 5(-11.8)

Now, perform the multiplications:

-108 + 59

Finally, add the two values:

-108 + 59 = -49

So, the value of the expression when a = -2 is -49.