Question

(a∧2-16)/(5a∧2+20), при a=0,4​

Answer 1

Объяснение:

решение написала,только видимо букву а пропустили возле 20

Answer 2

To evaluate the expression (a^2 - 16) / (5a^2 + 20) when a = 0.4, you simply need to substitute the value of a into the expression and calculate the result.

Let's plug in the value a = 0.4:

(a^2 - 16) / (5a^2 + 20) = (0.4^2 - 16) / (5 * 0.4^2 + 20)

Now, perform the calculations:

(0.4^2) = 0.16 (5 * 0.4^2) = 0.16

Substitute the values:

(0.16 - 16) / (0.16 + 20) = (-15.84) / (20.16)

Now, divide:

-15.84 / 20.16 ≈ -0.7857142857142857

So, when a = 0.4, the expression (a^2 - 16) / (5a^2 + 20) evaluates to approximately -0.7857.