Question

(a-b) (a+2) -(a+b) (a-2) при a=1 найти значение выражения ​

Answer 1

(1-b)(1+2)-(1+b)(1-2)=3(1-b)+(1+b)=3-3b+1+b=4-2b=2(2-b)

Answer 2

To find the value of the expression (a-b)(a+2) - (a+b)(a-2) when a=1, we simply substitute the value of 'a' into the expression and perform the calculations:

(a-b)(a+2) - (a+b)(a-2) (where a=1)

(1-b)(1+2) - (1+b)(1-2)

Now, let's simplify:

(1-b)(3) - (1+b)(-1)

Expand each term:

3 - 3b - (-1 + b)

Now, distribute the negative sign:

3 - 3b + 1 - b

Combine like terms:

4 - 4b

So, when a=1, the value of the expression (a-b)(a+2) - (a+b)(a-2) is 4 - 4b.