Multiply Using the Rule for the Product of the Sum $$( 3 x - y + 4 z ) ( 3 x - y - 4 z )$$

question 79

Multiple Choice

Multiply using the rule for the product of the sum and difference of two terms. Assume any variable exponents represent whole numbers.
- $$( 3 x - y + 4 z ) ( 3 x - y - 4 z )$$

• A) \(9 x ^ { 2 } - 6 x y + y ^ { 2 } + 24 x z + 8 y z - 16 z ^ { 2 }\)
• B) \(9 x ^ { 2 } - 6 x y + y ^ { 2 } - 16 z ^ { 2 }\)
• C) \(9 x ^ { 2 } + y ^ { 2 } - 16 z ^ { 2 }\)
• D) \(9 x ^ { 2 } + y ^ { 2 } + 24 x z + 8 y z - 16 z ^ { 2 }\)

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A group of people born at about the same time and exposed to the same societal events; cohort effects are confounded with age in a cross-sectional study.

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