Question

(15 - 3n)(4+ 6n) + (5n - 4)(5 – 3n) Плиз.​

Answer 1

Ответ:

-33n2 + 115n + 40

Объяснение:

Answer 2

$(15 - 3n)(4 + 6n) + (5n - 4)(5 - 3n)$

$60 + 90n - 12n - 18 {n}^{2} + 25n - 15 {n}^{2} -$

$- 20 + 12n =$

$= - 33 {n}^{2} + 115n + 40.$

Ответ :

$- 33 {n}^{2} + 115n + 40$

Answer 3

Sure, I'd be happy to help you simplify the expression:

(15 - 3n)(4 + 6n) + (5n - 4)(5 - 3n)

To simplify this, we'll first expand each set of parentheses and then combine like terms:

Step 1: Expand the first set of parentheses (15 - 3n)(4 + 6n): = 15 * 4 + 15 * 6n - 3n * 4 - 3n * 6n = 60 + 90n - 12n - 18n^2 = -18n^2 + 78n + 60

Step 2: Expand the second set of parentheses (5n - 4)(5 - 3n): = 5n * 5 - 5n * 3n - 4 * 5 + 4 * 3n = 25n - 15n^2 - 20 + 12n = -15n^2 + 37n - 20

Now, the expression becomes:

(-18n^2 + 78n + 60) + (-15n^2 + 37n - 20)

Step 3: Combine like terms: -18n^2 + (-15n^2) = -33n^2 78n + 37n = 115n 60 - 20 = 40

Finally, the simplified expression is:

-33n^2 + 115n + 40