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Expand the trinomial using the formula $\left(a+b+c\right)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc$
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$a^2+b^2+\left(-c-d\right)^2-2ab+2a\left(-c-d\right)-2b\left(-c-d\right)$
Learn how to solve simplification of algebraic expressions problems step by step online. Simplify the expression (a-b-c-d)^2. Expand the trinomial using the formula \left(a+b+c\right)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc. Expand \left(-c-d\right)^2. Solve the product 2a\left(-c-d\right). Solve the product \left(-2c-2d\right)a.