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Solving radical equations
1) Solve √(20 - r) = r :
3
2
4
8
1/10
Solution
Answer:
4
Explanation:
√(20 - r) = r
Squaring on both sides
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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