Question

2х+4-(2-х)(х+2)и найдите его значение при х= -3

Answer 1

сократим это выражение, в скобках выражена разница квадратов, тогда:

=

2х + 4 - (4 - х^2) =

2 x + 4 -4 + x^2 =

x^2 + 2x

при х = -3

9 - 6 = 3

Answer 2

To find the value of the expression 2x + 4 - (2 - x)(x + 2) when x = -3, we'll substitute -3 for x in the expression and perform the calculations step by step.

Step 1: Replace x with -3 in the expression: 2(-3) + 4 - (2 - (-3))(-3 + 2)

Step 2: Perform the calculations inside the parentheses: -6 + 4 - (2 + 3)(-1)

Step 3: Continue simplifying: -2 - (5)(-1)

Step 4: Perform the multiplication: -2 + 5

Step 5: Complete the addition: 3

So, when x = -3, the value of the expression is 3.