If the absolute value - 1 of a + 4 is 0, then the value of a is 0

If the absolute value - 1 of a + 4 is 0, then the value of a is 0

│a/(a+4)│-1=0
∴a/(a+4)=±1
∴a=±(a+4)
A = - A-4 or a = a + 4 (obviously not true)
∴a=-2
The Dragon sings for you, the Phoenix dances for you
Please click [satisfied answer]; if you are not satisfied, please point out, I will correct it!
Hope to give you a correct reply!
I wish you academic progress!

Given a ^ 2-7a-1 = 0, find the value of a ^ 2 + A ^ 2 / 1 and a ^ 4 + A ^ 4 / 1

a^2-7a-1=0,
a²-1=7a
a-1/a=7
(a-1/a)²=7²
a²-2+1/a²=49
a²+1/a²=51
(a²+1/a²)²=51²
a^4+2+1/a^4=2601
a^4+1/a^4=2599
If you don't understand this question, you can ask. If you are satisfied, please click "praise"

Who is bigger than 1, 4 / 3 and 3 / 4. 2, 7 / 10 and 0.7

4 / 3 = 16 / 12
3 / 4 = 9 / 12
So four-thirds is bigger
7 out of 10 = 7 △ 10 = 0.7
So 7 out of 10 is as big as 0.7

2 and 1 / 3 = 1 and 3 / 3

2 and 1 / 3 = 1 and 2.25 / 3

Comparison size: - 1____ -2, - 4 / 3___ -3 / 4

Greater than, less than

Which is bigger, 2 and 4 in 5 or 2 and 2 in 3?

It must be two and four fifths

(+ 1 / 2) - (- 4 / 5) + - 2 / 3 - (+ 1 / 2) + - 1 / 3)=

=1/2+4/5-2/3-1/2-1/3
=(1/2-1/2)+4/5-(2/3+1/3)
=0+4/5-1
=-1/5

1.2 △ 4 / 3

1.6

Who knows: 1 / 2 = 1 / 3 + () 1 / 3 = 1 / 4 + () 1 / 2 = () 1 / 3 + () 1 / 2?
Another question: 1 / 4 = () 1 / 4 + () 1 / 4 + () 1 / 4?

6
twelve
4 5 20
8 9 72

(- 4 1 / 2) - 5 3 / 4

Original formula = - 4-5-1 / 2-3 / 4
=-9-5 / 4
=-Nine and five fourths