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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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$a^2+b^2+\left(-3c\right)^2+2ab+2\cdot -3ac+2\cdot -3bc$
Learn how to solve simplification of algebraic expressions problems step by step online. Simplify the expression (a+b-3c)^2. Expand the trinomial using the formula \left(a+b+c\right)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc. Multiply 2 times -3. Multiply 2 times -3.