Question

(а +2) ^2 -а (4-7а) если а= -1/2​

Answer 1

Ответ:

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Ответ 1/2

Answer 2

Ответ:

Пошаговое объяснение:

2468∛

Answer 3

To evaluate the expression (а + 2)^2 - а(4 - 7а) when а = -1/2, we simply substitute the value of а into the expression and perform the arithmetic.

Given а = -1/2:

(а + 2)^2 - а(4 - 7а)

Substitute the value of а:

((-1/2) + 2)^2 - (-1/2)(4 - 7*(-1/2))

Now, perform the operations inside the parentheses:

(3/2)^2 - (-1/2)(4 + 7/2)

Now, square (3/2):

(9/4) - (-1/2)(15/2)

Now, distribute the negative sign:

(9/4) + (15/4)

Now, add the fractions:

(9/4) + (15/4) = 24/4 = 6

Therefore, when а = -1/2, the value of the expression (а + 2)^2 - а(4 - 7а) is 6.