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Simplify radical expressions with variables
1) Solve √(20 - r) = r
r = 3
r = 6
r = 9
r = 4
1/10
Solution
Answer:
r = 4
Explanation:
√(20 - r) = r
20 - r = r²
r² + r - 20 = 0
(r + 5) (r - 5) = 0
r = -5
r = 4
Since r = -5 is a -ve quantity omitted so
r = 4
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