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Question: What do you mean by Expand ?

Answer:

An algebraic expression is expanded by multiplying out brackets.

For example, a(b + c) becomes ab + bc,

while (2x + 3)(x - 1)

= 2x (x - 1) + 3(x - 1)

= 2 x 2 - 2x + 3x - 3

= 2 x 2 + x - 3