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How do you simplify $\sqrt{7} (3 - \sqrt{7})$ $sqrt7(3-sqrt7)$ ?

1 Answer

Sep 1, 2016

$3 \sqrt{7} - 7$ $3sqrt(7)-7$

Explanation:

$\sqrt{7} (3 - \sqrt{7})$ $color(red)(sqrt(7))(3-sqrt(7))$

by distribution
$XXX = \sqrt{7} \cdot 3 - \sqrt{7} \cdot \sqrt{7}$ $color(white)("XXX")=color(red)(sqrt(7))*3 - color(red)(sqrt(7))*sqrt(7)$

$XXX = 3 \sqrt{7} - 7$ $color(white)("XXX")=3sqrt(7)-7$

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