1. On the Argand diagram, z = 2 + 3i and w = (1 + i)z. Which Cartesian form gives w?
Expand w = (1 + i)(2 + 3i) = 2 + 3i + 2i + 3i² = -1 + 5i.
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Expand w = (1 + i)(2 + 3i) = 2 + 3i + 2i + 3i² = -1 + 5i.
Since b . a = 14 and a . a = 20, proj_a b = (14 / 20)a. Hence p = b - proj_a b = (-9 / 5, 18 / 5), with magnitude √405 / 5 = 9sqrt(5) / 5.
Use the A column: 120 x 0.70 + 80 x 0.40 = 84 + 32 = 116.
Factor the equation as (2cos x - 1)(cos x + 1) = 0. Thus cos x = 1 / 2 or cos x = -1. On 0 <= x < 2π, these occur at π / 3, 5π / 3, and π, giving three solutions.
Velocity remains non-negative on 0 <= t <= 6. The distance is the triangular area under the graph: 1 / 2 x 6 x 12 = 36 m.
The next sum adds the next cube to the assumed k-case. Therefore Sₖ₊₁ starts as [k(k + 1) / 2]² + (k + 1)³ before simplification.
TASC Year 11 Mathematics Specialised practice should make complex numbers, vectors, proof, mechanics, and further calculus feel structured rather than guessable. These examples preview that style before the no-login Mathematics Specialised demo.
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