Multiply (7–√) (−2–√) . Give an exact answer.(1 point) Responses −72–√ negative 7 start root 2 end root 14−−√ start root 14 end root 5–√ start root 5 end root −14−−√

1 answer

To multiply the two expressions \( (7 - \sqrt{2})(-2 - \sqrt{14}) \), we can use the distributive property (also known as the FOIL method for binomials):

\[ (7 - \sqrt{2})(-2 - \sqrt{14}) = 7 \cdot (-2) + 7 \cdot (-\sqrt{14}) - \sqrt{2} \cdot (-2) - \sqrt{2} \cdot (-\sqrt{14}) \]

Now calculate each term:

  1. \( 7 \cdot (-2) = -14 \)
  2. \( 7 \cdot (-\sqrt{14}) = -7\sqrt{14} \)
  3. \( -\sqrt{2} \cdot (-2) = 2\sqrt{2} \)
  4. \( -\sqrt{2} \cdot (-\sqrt{14}) = \sqrt{28} = 2\sqrt{7} \)

Combining all these results, we have:

\[ -14 - 7\sqrt{14} + 2\sqrt{2} + 2\sqrt{7} \]

Thus, the exact result of multiplying \( (7 - \sqrt{2})(-2 - \sqrt{14}) \) is:

\[ -14 - 7\sqrt{14} + 2\sqrt{2} + 2\sqrt{7} \]

This expression can be organized as:

\[ -14 + 2\sqrt{2} + 2\sqrt{7} - 7\sqrt{14} \]

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