5. Factorise x2 + 3√2 x + 4.
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→ x² + 3√2x + 4 = 0
→ x² + 2√2x + √2x + 4 = 0
→ x(x + 2√2) + √2(x + 2√2) = 0
→ (x + 2√2)(x + √2) = 0
→ x = -√2 & -2√2
Hence, x = -√2 & -2√2
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