Chapter 6: Problem 22
Find coordinates for three different vectors \(\mathbf{u}\), each of which has a direction determined by an angle of \(\frac{\pi}{6}\).
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Chapter 6: Problem 22
Find coordinates for three different vectors \(\mathbf{u}\), each of which has a direction determined by an angle of \(\frac{\pi}{6}\).
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Evaluate \(|4-3 i|\).
Show that if \(\mathbf{u}\) and \(\mathbf{v}\) are vectors and \(t\) is a real num- ber, then $$ (t \mathbf{u}) \cdot \mathbf{v}=\mathbf{u} \cdot(t \mathbf{v})=t(\mathbf{u} \cdot \mathbf{v}) $$
Suppose \(a \neq 0\) and \(b^{2}<4 a c .\) Verify by direct calculation that $$ \begin{array}{l} a x^{2}+b x+c= \\ a\left(x-\frac{-b+\sqrt{4 a c-b^{2}} i}{2 a}\right)\left(x-\frac{-b-\sqrt{4 a c-b^{2}} i}{2 a}\right) \end{array} $$.
Write each expression in the form \(a+b i,\) where \(a\) and \(b\) are real numbers. $$ \frac{3-4 i}{6-5 i} $$
Show that \(\overline{w \cdot z}=\bar{w} \cdot \bar{z}\) for all complex numbers \(\mathcal{w}\) and \(z\)
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