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Tems11 [23]
3 years ago
14

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Mathematics
1 answer:
butalik [34]3 years ago
5 0

Answer:

Step-by-step explanation:

- 16t² +400 = 0

t² = 400/16

t² = 25

t = 5 or t = - 5

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Find the exact value of cos285 using the fact that 285=330-45
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\bf \textit{Sum and Difference Identities}
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cos(\alpha - \beta)= cos(\alpha)cos(\beta) + sin(\alpha)sin(\beta)\\\\
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cos(285^o)
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cos(330^o-45^o)=cos(330^o)cos(45^o)+sin(330^o)sin(45^o)
\\\\\\
cos(330^o-45^o)=\left( \frac{\sqrt{3}}{2} \right)\left( \frac{\sqrt{2}}{2} \right)~~+~~\left( \frac{1}{2} \right)\left( \frac{\sqrt{2}}{2} \right)
\\\\\\
cos(330^o-45^o)=\cfrac{\sqrt{6}}{4}+\cfrac{\sqrt{2}}{4}\implies cos(330^o-45^o)=\cfrac{\sqrt{6}+\sqrt{2}}{4}
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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