Question

how is I can't understand this (don't further solve it's already solved but I am not able to understand how it come so)
= (3x)² – 2(3x) (7) + (7)² =

= (3x –7)²​

Answer 1

Answer:

hii sis

Step-by-step explanation:

its an identity (a-b)^2=a^2-2ab+b^2

therefore here this identity is used

pls mark my ans as brainliest......

thanks sis for following me

Answer 2

Don't worry , I'll explain to you..to the maximum I can...

To understand this , first you should know an identity ,

(a-b)²=a²-2ab+b²

With this identity you got this expression = (3x –7)² from this = (3x)² – 2(3x) (7) + (7)² .

The expression , (3x)² – 2(3x) (7) + (7)² is in the form of a²-2ab+b² , so we just reversed it .

Where a=3x ; b=7

So , we wrote it in the form (a-b)² that is (3x-7)²

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