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Andreyy89
3 years ago
12

Add the expression (algebra)

Mathematics
2 answers:
vodka [1.7K]3 years ago
6 0

Step-by-step explanation:

1.

(2x+5)+(x+4)\\2x+5+x+4\\2x+x+5+4\\3x+9

2.

(3y-5)+(2y+4)\\3y-5+2y+4\\3y+2y-5+4\\5y-1

3.

(4a+12)+(-6a-13)\\4a+12-6a-13\\4a-6a+12-13\\-2a-1

4.

(3x+3)-(4x+6)\\3x+3-4x-6\\3x-4x+3-6\\-x-3

5.

(8y-7)-(y-4)\\8y-7-y+4\\8y-y-7+4\\7y-3

6. Incomplete (3b + ?)

7.

16y-8\\(8)(2y-1)

8.

-12c-8\\(4)(-3c-2)

kifflom [539]3 years ago
3 0
1. 3x + 9
2.5y - 1
3.-2a - 1
4. x - 3
5. 7y - 3
6. b - 7
7. 8(2y - 1)
8. -4(3c + 2)
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Read 2 more answers
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Answer: ab =6

have:

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=> a + b + 1 = ab

⇔ a + b + 1 - ab = 0

⇔ b - 1 - a(b - 1) + 2 = 0

⇔ (b - 1)(1 - a) = -2

because a and b are postive integers => (b - 1) and (1 - a) also are integers

=> (b - 1) ∈ {-1; 1; 2; -2;}

(1 -a) ∈  {-1; 1; 2; -2;}

because (b -1).(1-a) = -2 => we have the table:

b - 1        -1             1              2             -2

1 - a         2            -2            -1              1

a              -1            3             2              0

b              0            2             3              -1

a.b            0           6             6               0

because a and b  are postive integers

=> (a;b) = (3;2) or (a;b) = (2;3)

=> ab = 6

Step-by-step explanation:

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