Question

expand this question
( 7x - 3y )²​

Answer 1

Answer:

We know (a+b)

2

=a

2

+2ab+b

2

By using this identity, we get

(7x+3y)

2

=(7x)

2

+(3y)

2

+2×7x×3y

=49x

2

+9y

2

+42xy

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Answer 2

To expand : $(7x -3y ) ^{2}$

Solution :

• To expand the given expression , we apply the identity given below ,
• $( a -b )^{2} = a^{2} -2ab + b^{2}$ .
• Therefore , by substituting the values we expand the given expression .  

• $(7x - 3y)^{2}$

• Here, $a = 7x$ and $b = 3y$  

      $(7x -3y ) ^{2}$ $= (7x )^{2} -2 (7x ) ( 3y ) + (3y)^{2}$

                      $= 49x^{2} -42xy + 9y^{2}$  

Hence , expanded form of $(7x -3y ) ^{2}$  is $49x^{2} -42xy + 9y^{2}$ .