Differences

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--- howto:hambasics:sections:test [2021/01/06 20:28] – [Differential Equations] va7fi
+++ howto:hambasics:sections:test [2021/02/13 18:58] – va7fi
@@ Line 24: / Line 24: @@
 \begin{align*}
-(1+i)^2 &= 1 + 2i + i^2 \\
+(1+i)^2
+&= (1+i)\dot(1+i)
+&= 1 + 2i + i^2 \\
 &= 1 + 2i - 1 \\
 &= 2i
@@ Line 358: / Line 360: @@
 \$r\$ then:
-\$$ r = \left\{ \begin{array}{rl} -\alpha \pm \beta & \text{if } b^2 - 4ac > 0,\\
+\$$ r = \left\{ \begin{array}{ll} -\alpha \pm \beta & \text{if } b^2 - 4ac > 0,\\
  -\alpha \pm i \beta & \text{if } b^2 - 4ac < 0, \end{array} \right. \$$