Write a polynomial with the following given zeros (roots): \( -2,-3,4-3 i \)
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To construct a polynomial with the given roots \( -2, -3, \) and \( 4 - 3i \), we first note that complex roots occur in conjugate pairs. Therefore, the conjugate \( 4 + 3i \) is also a root. The polynomial can be expressed as: \[ P(x) = (x + 2)(x + 3)(x - (4 - 3i))(x - (4 + 3i)) \] Now, simplifying the complex pair: \[ (x - (4 - 3i))(x - (4 + 3i)) = ((x - 4) + 3i)((x - 4) - 3i) = (x - 4)^2 + 9 \] Expanding it gives: \[ (x - 4)^2 + 9 = x^2 - 8x + 16 + 9 = x^2 - 8x + 25 \] Now putting it all together: \[ P(x) = (x + 2)(x + 3)(x^2 - 8x + 25) \] We can multiply out the first two factors: \[ (x + 2)(x + 3) = x^2 + 5x + 6 \] Now the polynomial becomes: \[ P(x) = (x^2 + 5x + 6)(x^2 - 8x + 25) \] Next, we expand this: 1. \( x^2 \cdot (x^2 - 8x + 25) = x^4 - 8x^3 + 25x^2 \) 2. \( 5x \cdot (x^2 - 8x + 25) = 5x^3 - 40x^2 + 125x \) 3. \( 6 \cdot (x^2 - 8x + 25) = 6x^2 - 48x + 150 \) Combining these, we find: \[ P(x) = x^4 - 3x^3 + 81x^2 + 125x + 150 \] So the polynomial with the given roots is: \[ P(x) = x^4 - 3x^3 + 81x^2 + 125x + 150 \]