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VikaD [51]
3 years ago
9

Can anyone help me please?!

Mathematics
1 answer:
vodomira [7]3 years ago
7 0

Answer:

x =  \sqrt{30}

Step-by-step explanation:

By Geometric Mean Property:

BD =  \sqrt{7 \times 3}  \\  \\ BD =  \sqrt{21}  \\  \\  In \: right\: \triangle BDC \\  \\ By \: Pythagoras \: Theorem \\  \\  {x}^{2}  =  { \sqrt{21} }^{2}  +  {3}^{2} \\  \\  {x}^{2}  =21  +  9\\  \\  {x}^{2}  =30 \\  \\  \huge \purple{x =  \sqrt{30} }

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