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Update Quadratic Equations.md

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James Su 2019-12-30 02:38:32 +00:00
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Grade 10/Math/MPM2DZ/Math Oral Presentation Questions/Quadratic Equations.md
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@ -179,8 +179,6 @@ When $`h = 0`$, the ball hits ground, so:
$`-3.2t^2 + 12.8 + 1 = 0`$ $`-3.2t^2 + 12.8 + 1 = 0`$
$`t = \dfrac{-12.8 \pm \sqrt{12.8^2 - 4(3.2)}}{-6.4}`$
$`t = \dfrac{12.8 \pm \sqrt{151.04}}{6.4}`$ $`t = \dfrac{12.8 \pm \sqrt{151.04}}{6.4}`$
$`\because t \ge 0`$ $`\because t \ge 0`$
@ -199,7 +197,6 @@ $`16t^2 - 96t + 128 = 0`$
$`t^2 - 6t + 8 = 0`$ $`t^2 - 6t + 8 = 0`$
$`(t-2)(t-4)`$, at seconds $`2`$ and $`4`$, the rocket reaches $`128m`$. $`(t-2)(t-4)`$, at seconds $`2`$ and $`4`$, the rocket reaches $`128m`$.
### Question 5 b) ### Question 5 b)
@ -212,8 +209,6 @@ $`-40d^2 + 200d = 300 - 40d`$
$`40d^2 - 240d + 300 = 0`$ $`40d^2 - 240d + 300 = 0`$
$`4d^2 - 24d + 30 = 0`$
$`2d^2 - 12d + 15 = 0`$ $`2d^2 - 12d + 15 = 0`$
$`d = \dfrac{12 \pm \sqrt{24}}{4}`$ $`d = \dfrac{12 \pm \sqrt{24}}{4}`$