Please answer the picture with proper solution.
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square both sides
19 - 4√x = 12 + 7 - 2√84
2√x = √ 84
square again
4x = 84
x =21
so (C) is the answer
19 - 4√x = 12 + 7 - 2√84
2√x = √ 84
square again
4x = 84
x =21
so (C) is the answer
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