Simplify the Expression $( \sqrt { 6 } - 7 ) ( \sqrt { 7 } + 3 )$

question 112

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $( \sqrt { 6 } - 7 ) ( \sqrt { 7 } + 3 )$

• A) \(\sqrt { 42 } - 4 \sqrt { 7 } - 21\)
• B) \(- 3 \sqrt { 42 } - 21\)
• C) \(\sqrt { 42 } - 21\)
• D) \(\sqrt { 42 } + 3 \sqrt { 6 } - 7 \sqrt { 7 } - 21\)

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Definitions:

Preventive Maintenance

Scheduled maintenance activities designed to prevent equipment failures before they occur, aimed at reducing downtime and increasing reliability.

Breakdown Maintenance

involves repairs or adjustments made after equipment has failed, aiming to restore it to operational condition.

MTBF

"Mean Time Between Failures," a reliability measure for products indicating the average time between operational failures.