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Rewrite each expression in standard form.a)(x+3i)(x− 3i)b)(x+i)²(x-i)²
4 months ago
Q:
Rewrite each expression in standard form.a)(x+3i)(x− 3i)b)(x+i)²(x-i)²
Accepted Solution
A:
Answer:a) x² +9b) x⁴ + 2 x² + 1Step-by-step explanation:a) (x+3 i)(x− 3 i) = x² - (3 i ) x + (3 i ) x - (3 i)² = x² - 9 i² ∵ i² = -1 = x² - 9 (-1) = x² +9b) (x+i)²(x-i)² = (x² + i² + 2 x i)(x² + i² - 2 x i) = ((x² -1 )+ 2 x i)((x² -1) - 2 x i)using identity (a + b)(a - b) = a² - b² = (x² -1)² - (2 x i)² = x⁴ + 1 - 2x² - 4x² i² = x⁴ + 1 - 2 x² + 4 x² = x⁴ + 2 x² + 1