Question

ALL IDENTITIES OF 3X+5​

Answer 1

Answer:

We have the identity (a+b)

2

=a

2

+2ab+b

2

Here a=3x,b=5

By using this identity, we can solve further as

(3x+5)

2

=(3x)

2

+5

2

+2×3x×5=9x

2

+25+30x

This is the required answer.

Step-by-step explanation:

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Answer 2

Answer:

Given (3x + 4) (3x – 5)

3x (3x – 5) + 4 (3x – 5)

(3x )² – (5 × 3x) + (4 × 3x) – (5 × 4)

9x² – 15x + 12x – 20

9x² – 3x – 20

9x² – (15 – 12)x – 20

9x² – 15x + 12x – 20

3x (3x – 5) + 4 (3x – 5)

(3x – 5)(3x + 4)

So

3x – 5 = 0 or

3x + 4 = 0

x = 5/3 or x = -4/3