1.

Hi can u pls tell me all the answers of these all with steps

Answer»

Answer:

1. x=-1

(i) 2x-7

= - 2x-7

=14

(ii) - x+2

=1+2

=3

(iii) x²+2x+1

=1-2+1

=1-3

=-2

(IV) 2x²-x-2

=2+1-2

=3-2

=1

2. a=2,b=-2

(i) a²+b²

=4+4

=8

(ii) a²+ab+b²

=4+2x-2+4

=4-4+4

=4-8

=-4

(iii) a²-b²

=4-4

=8

3. a=0, b=-1

(i) 2a+2b

=0-1

=-1

(ii) 2a²+b²+1

=0+1+1

=2

(iii) 2a²b+2ab²+ab

=-1+1-1

=0-1

-1

(iv) a²+ab+2

=0-1+2

=1

4. x=2

(i) x+7+4(x-5)

=2+7+4(2-5)

=2+7+4-3

=13-3

=10

(ii) 3(x+2)+5x-7

=3(2+2)+10-7

=3x4+10-7

=12+10-7

=22-7

=15

(iii) 6x+5(x-2)

=12+5(2-2)

=12+5x0

=12+0

=12

(iv) 4(2x-1)+3x+11

=4(4-1)+6+11

=4x3+6+11

=12+6+11

=29

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