Question

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Answer 1

Answer:

Sum = 3a²+5ab-7b²+11a²-6ab+2b²

= 14a²-ab-5b²

Difference= 14a²-ab-5b²-(a²-2ab-3b²)

= 14a²-ab-5b²-a²+2ab+3b²

=13a²+ab-2b²

Answer 2

Explanation:

The ratio between two adjacent angles of a || gm ABCD are in the ratio 4 : 5

Let

∠

A

=

4

x

a

n

d

∠

B

=

5

x

But

∠

A

+

∠

B

=

180

∘

⇒

4

x

+

5

x

=

180

∘

⇒

9

x

=

180

∘

∴

x

=

180

∘

9

=

20

∘

∴

∠

A

=

4

x

=

4

×

20

∘

=

80

∘

∠

B

=

5

x

=

5

×

20

=

100

∘

Answer 3

Explanation:

The ratio between two adjacent angles of a || gm ABCD are in the ratio 4 : 5

Let

∠

A

=

4

x

a

n

d

∠

B

=

5

x

But

∠

A

+

∠

B

=

180

∘

⇒

4

x

+

5

x

=

180

∘

⇒

9

x

=

180

∘

∴

x

=

180

∘

9

=

20

∘

∴

∠

A

=

4

x

=

4

×

20

∘

=

80

∘

∠

B

=

5

x

=

5

×

20

=

100

∘

Answer 4

Explanation:

The ratio between two adjacent angles of a || gm ABCD are in the ratio 4 : 5

Let

∠

A

=

4

x

a

n

d

∠

B

=

5

x

But

∠

A

+

∠

B

=

180

∘

⇒

4

x

+

5

x

=

180

∘

⇒

9

x

=

180

∘

∴

x

=

180

∘

9

=

20

∘

∴

∠

A

=

4

x

=

4

×

20

∘

=

80

∘

∠

B

=

5

x

=

5

×

20

=

100

∘