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:

Formed Elements

Cells (i.e., red and white blood cells) and cell fragments (i.e., platelets) of blood.

Leukocytes

White blood cells that are part of the body's immune system, involved in protecting the body against both infectious disease and foreign invaders.

Erythrocytes

Red blood cells, which are responsible for carrying oxygen from the lungs to all parts of the body and returning carbon dioxide to the lungs for expulsion.

Thrombocytes

Also known as platelets, are blood cells involved in clot formation to prevent bleeding.