Question

А) 2 (x + y) -5 (x + y) +4 (x + y) b) (2x-3) (2x + 3). ​

Answer 1

ответ:

Подробное объяснение:

Answer 2

а) 2 (x + y) -5 (x + y) +4 (x + y) = (х+у)(2-5+4) = х+у

b) (2x-3) (2x + 3) = (2х)² - 3² = 4х² - 9

Answer 3

Let's simplify the expressions step by step:

A) 2(x + y) - 5(x + y) + 4(x + y)

First, distribute the coefficients:

= (2x + 2y) - (5x + 5y) + (4x + 4y)

Next, combine like terms:

= 2x + 2y - 5x - 5y + 4x + 4y

Now, group the x and y terms:

= (2x - 5x + 4x) + (2y - 5y + 4y)

Combine the x and y terms:

= (2 - 5 + 4)*x + (2 - 5 + 4)*y

Simplify:

= 1x + 1y

Finally, we can just write it as:

= x + y

B) (2x - 3)(2x + 3)

To simplify this expression, we'll use the FOIL method (First, Outer, Inner, Last):

FOIL:

= 2x * 2x + 2x * 3 - 3 * 2x - 3 * 3

Multiply:

= 4x^2 + 6x - 6x - 9

Combine like terms:

= 4x^2 - 9

So, the simplified form of (2x - 3)(2x + 3) is:

= 4x^2 - 9