Math, asked by nasimdmk1981, 9 months ago

7. a (3a - 2) - 1
8. a b
9. 3-a (4 + 7a)
10. (2a + b)2 - 6a - 36 - 4
11. 1 - 2a - 2b - 3 (a + b)2
12. 3a2 - 1-2a
13 2 + 3x + 2 + ax + 2a​

Answers

Answered by rachitshama854
0

Answer:

ANSWER:

(i)

5x + 7x + (-6x)

= 5x + 7x -6x

= 6x

(ii)

3

5

x +

2

3

x +

-4

5

x=

9x +10x -12x

15

=

7x

15

(iii)

5a2b +( −8a2b) + 7a2b

= 5a2b − 8a2b + 7a2b

4a2b

(iv)

3

4

x2 + 5x2+ (-3x2 ) + (-

1

4

x2)=

3

4

x2 -

1

4

x2 + 5x2-3x2=

1

2

x2 + 2x2 =

5

2

x2

(v) Collecting like terms and adding them:

x − 3y + 4z + y − 2x − 8z + 5x − 2y − 3z

= x- 2x + 5x - 3y + y - 2y + 4z - 8z - 3z

= 4x -4y -7z

(vi) Collecting like terms and adding them:

2x2 − 3y2 + 5x2 + 6y2 + (− 3x2 − 4y2)

= 2x2 + 5x2 - 3x2 - 3y2 +6y2 -4y2= 4x2 -y2

(vii) Collecting like terms and adding them:

5x − 2x2 − 8 + 8x2 − 7x − 9 + 3 + 7x2 − 2x

= -2x2 +8x2 + 7x2 + 5x - 7x - 2x -8 -9 + 3= 13x2 -4x -14

(viii) Collecting like terms and adding them:

2

3

a-

4

5

b+

3

5

c +(-

3

4

a -

5

2

b+

2

3

c )+

5

2

a+

7

4

b-

5

6

c b -

5

2

b +

7

4

b +

3

5

c +

2

3

c -

5

6

c =

(8 -9 +30)a

12

+

(-16 - 50 +35)b

20

+

(18 +20 -25)c

30

=

29

12

a -

31

20

b +

13

30

c

(ix) Collecting like terms and adding them:

8

5

x+

11

7

y+

9

4

xy + (-

3

2

x-

5

3

y-

9

5

xy)=

8

5

x -

3

2

x+

11

7

y -

5

3

y +

9

4

xy -

9

5

xy =

1

10

x -

2

21

y +

9

20

xy

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