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Which expression is equal to...?
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Which expression is equal to...?

Which expression is equal to...?-example-1
User Vadim Rybak
by
5.2k points

1 Answer

2 votes

- √7

using the ' law of radicals '

√a × √b ⇔ √ab

simplifying each radical

√28 = √(4 × 7) = √4 × √7 = 2√7

√63 = √(9 × 7) = √9 × √7 = 3√7

7√28 - 5√63 = 7(2√7) - 5(3√7) = 14√7 - 15√7 = - √7


User Jeromegamez
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