Question

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I just want to know how do we get
(a + c - 2b)²

Answer 1

Answer:

Solution

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Write the following in the expanded form:

(a+2b+c)

2

Medium

Solution

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Formula,

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

Given,

(a+2b+c)

2

=a

2

+(2b)

2

+c

2

+2a(2b)+2(2b)c+2ca

=a

2

+4b

2

+c

2

+4ab+4bc+2ac