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(b) Work out the value of (√2+√8)^2


User Elpisu
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~~~\left(\sqrt 2 + \sqrt 8 \right)^2\\\\=\left(\sqrt 2 \right)^2 + \left(\sqrt 8 \right)^2 +2 \sqrt 2 \sqrt 8\\\\=2+8+2√(2 \cdot 8)\\\\=10+2√(16)\\\\=10+2(4)\\\\=10+8\\\\=18

User Gerhard Burger
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