Question

А)(2a + b)(a - 3b)Б)(3x³-1)(2x-3)очень надо

Answer 1

А)(2a + b)(a - 3b)
2a^2-6ab+ab-3b^2
2a^2-5ab-3b^2
Б)(3x³-1)(2x-3)
6x^4-6x^3-2x+3
 вот начало дальше попробуй сама 
я запуталась

Answer 2

A) (2a + b)(a - 3b)

To expand the expression (2a + b)(a - 3b), we can use the distributive property. This property states that for any real numbers a, b, and c, the product of (a + b) and c is equal to the sum of the products of a and c and b and c.

So, let's apply the distributive property to expand the expression:

(2a + b)(a - 3b) = 2a(a - 3b) + b(a - 3b)

Now, we can simplify each term separately:

1. Expanding the first term: 2a(a - 3b) = 2a * a - 2a * 3b = 2a^2 - 6ab 2. Expanding the second term: b(a - 3b) = b * a - b * 3b = ab - 3b^2

Putting it all together, we have:

(2a + b)(a - 3b) = 2a^2 - 6ab + ab - 3b^2

Simplifying further, we can combine like terms:

(2a + b)(a - 3b) = 2a^2 - 5ab - 3b^2

B) (3x³ - 1)(2x - 3)

To expand the expression (3x³ - 1)(2x - 3), we can again use the distributive property. Let's apply the distributive property to expand the expression:

(3x³ - 1)(2x - 3) = 3x³ * 2x - 3x³ * 3 - 1 * 2x + 1 * 3

Now, we can simplify each term separately:

1. Expanding the first term: 3x³ * 2x = 6x⁴ 2. Expanding the second term: -3x³ * 3 = -9x⁴ 3. Expanding the third term: -1 * 2x = -2x 4. Expanding the fourth term: 1 * 3 = 3

Putting it all together, we have:

(3x³ - 1)(2x - 3) = 6x⁴ - 9x³ - 2x + 3

Simplifying further, we can combine like terms:

(3x³ - 1)(2x - 3) = 6x⁴ - 9x³ - 2x + 3

I hope this helps! Let me know if you have any further questions.