Question

2а(3а-5)-4а(4а-5) если а= -0.2​

Answer 1

Ответ:

-2,4

Пошаговое объяснение:

6а^2-10а-16а^2+20а=-10а^2+10а

При а=-0,2:

-10×(-0,2)^2+10×(-0,2)=-0,4-2=-2,4

Вроде так

Answer 2

To find the value of the expression $2a(3a - 5) - 4a(4a - 5)$ when $a = -0.2$, you can substitute $-0.2$ for $a$ and then simplify the expression.

Let's do the calculations:

&= 2(-0.2)(3(-0.2) - 5) - 4(-0.2)(4(-0.2) - 5) \\ &= 2(-0.2)(-0.6 - 5) - 4(-0.2)(-0.8 - 5) \\ &= 2(-0.2)(-5.6) - 4(-0.2)(-5.8) \\ &= -2.24 + 4.64 \\ &= 2.4 \end{split} \] So, when \(a = -0.2\), the value of the expression \(2a(3a - 5) - 4a(4a - 5)\) is \(2.4\).