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Simplifying f(x) = 4(x + -1)(x + -3i)(x + 3i) Multiply f * x fx = 4(x + -1)(x + -3i)(x + 3i) Reorder the terms: fx = 4(-1 + x)(x + -3i)(x + 3i) Reorder the terms: fx = 4(-1 + x)(-3i + x)(x + 3i) Reorder the terms: fx = 4(-1 + x)(-3i + x)(3i + x) Multiply (-1 + x) * (-3i + x) fx = 4(-1(-3i + x) + x(-3i + x))(3i + x) fx = 4((-3i * -1 + x * -1) + x(-3i + x))(3i + x) fx = 4((3i + -1x) + x(-3i + x))(3i + x) fx = 4(3i + -1x + (-3i * x + x * x))(3i + x) fx = 4(3i + -1x + (-3ix + x2))(3i + x) Reorder the terms: fx = 4(3i + -3ix + -1x + x2)(3i + x) fx = 4(3i + -3ix + -1x + x2)(3i + x) Multiply (3i + -3ix + -1x + x2) * (3i + x) fx = 4(3i * (3i + x) + -3ix * (3i + x) + -1x * (3i + x) + x2(3i + x)) fx = 4((3i * 3i + x * 3i) + -3ix * (3i + x) + -1x * (3i + x) + x2(3i + x)) Reorder the terms: fx = 4((3ix + 9i2) + -3ix * (3i + x) + -1x * (3i + x) + x2(3i + x)) fx = 4((3ix + 9i2) + -3ix * (3i + x) + -1x * (3i + x) + x2(3i + x)) fx = 4(3ix + 9i2 + (3i * -3ix + x * -3ix) + -1x * (3i + x) + x2(3i + x)) Reorder the terms: fx = 4(3ix + 9i2 + (-3ix2 + -9i2x) + -1x * (3i + x) + x2(3i + x)) fx = 4(3ix + 9i2 + (-3ix2 + -9i2x) + -1x * (3i + x) + x2(3i + x)) fx = 4(3ix + 9i2 + -3ix2 + -9i2x + (3i * -1x + x * -1x) + x2(3i + x)) fx = 4(3ix + 9i2 + -3ix2 + -9i2x + (-3ix + -1x2) + x2(3i + x)) fx = 4(3ix + 9i2 + -3ix2 + -9i2x + -3ix + -1x2 + (3i * x2 + x * x2)) fx = 4(3ix + 9i2 + -3ix2 + -9i2x + -3ix + -1x2 + (3ix2 + x3)) Reorder the terms: fx = 4(3ix + -3ix + -3ix2 + 3ix2 + 9i2 + -9i2x + -1x2 + x3) Combine like terms: 3ix + -3ix = 0 fx = 4(0 + -3ix2 + 3ix2 + 9i2 + -9i2x + -1x2 + x3) fx = 4(-3ix2 + 3ix2 + 9i2 + -9i2x + -1x2 + x3) Combine like terms: -3ix2 + 3ix2 = 0 fx = 4(0 + 9i2 + -9i2x + -1x2 + x3) fx = 4(9i2 + -9i2x + -1x2 + x3) fx = (9i2 * 4 + -9i2x * 4 + -1x2 * 4 + x3 * 4) fx = (36i2 + -36i2x + -4x2 + 4x3) Solving fx = 36i2 + -36i2x + -4x2 + 4x3 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 36i2x-1 + -36i2 + -4x + 4x2 Simplifying f = 36i2x-1 + -36i2 + -4x + 4x2 Reorder the terms: f = -36i2 + 36i2x-1 + -4x + 4x2
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