Question

Which of the following is the product of (a + b)(a – b)?
a. a^2+b^2

b. a^2b^2

c. a^2+2ab+b^2

d. a^2-2ab+b^2

Answer 1

\(\large\color{ midnightblue }{ \rm (a+b)(a-b) =a^2-b^2 }\)

Answer 2

\(\large\color{blue }{ \rm (a+b)(a-b) =a^2-b^2 }\) Also,

\(\large\color{blue }{ \rm (a+b)(a+b) =a^2+2ab+b^2 }\)
\(\large\color{blue }{ \rm (a-b)(a-b) =a^2-2ab+b^2 }\)
\(\large\color{blue }{ \rm (a+i~b~)(~a-i~b) =a^2+b^2 }\)

Answer 3

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