Assume that A and B are nxn matrices. Which one of the following statements is NOT always true? 1. (AB)¯' = B¬Aª if A and B are invertible. 2. A(B+C)= AB+ AC. 3. If AB = BA, then (A+B) = A² +2AB+B² . 4. (AB)' = B' A'. 5. If AB = 0, then A=0 or B= 0.

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Equations and inequalities describe the relationship between two mathematical expressions.

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.