The product (a+b)(a-2b) is a^2 - ab - 2b^2
The product expression is given as:
(a+b)(a-2b)
Expand the bracket
a * a - a * 2b + b * a - b * 2b
Evaluate the product
a^2 - 2ab + ab - 2b^2
Evaluate the like terms
a^2 - ab - 2b^2
Hence, the product (a+b)(a-2b) is a^2 - ab - 2b^2
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