Question

(a-4)-(a+4)в квадрате, при а=1 целых 1/4

Answer 1

(а-4)-(а+4)
а=1 1/4 2
(1 1/4 - 4)-(1 1/4 +4)
2
(5/4-4)-5 1/4
2
(-11/4)-(21/4)

-11/4 - 441/16

-485/16 = -30 5/16 ; -30,3125

Answer 2

To simplify the expression (a-4) - (a+4) squared, and then evaluate it for a = 1 and a = 1 1/4, follow these steps:

Step 1: Expand the squared term (a+4)^2: (a+4)^2 = (a+4)(a+4) = a^2 + 8a + 16

Step 2: Now rewrite the expression with the expanded squared term: (a-4) - (a+4)^2 = (a-4) - (a^2 + 8a + 16)

Step 3: Distribute the negative sign to the terms inside the parentheses: = a - 4 - a^2 - 8a - 16

Step 4: Combine like terms: = -a^2 - 7a - 20

Now, let's evaluate the expression for a = 1 and a = 1 1/4:

a = 1: -1^2 - 7(1) - 20 = -1 - 7 - 20 = -28

a = 1 1/4: -1.25^2 - 7(1.25) - 20 = -1.5625 - 8.75 - 20 ≈ -30.3125

So, the simplified expression for both values of a is as follows: For a = 1: -28 For a = 1 1/4: approximately -30.3125