Evaluate u + xy, for u = 20, x = 9, and y = 8

Mathematics

2 answers:

elena-14-01-66 [18.8K]4 years ago

8 0

This is how you work it out:
u + xy
Plug in your numbers that you know:
20 + 9 * 8
20 + 72
92

stiks02 [169]4 years ago

3 0

20+9(8)..... (Substitute and multiply 9 by 8 20+72 (add 20 and 72) 92

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Solve the simultaneous equations C^2+d^2=5 and 3c+4d=2

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If 3c+4d=2 then c=(2-4d)/3
And if you put that into the other equation
${\frac{2 - 4d}{3}}^{2} + {d}^{2} = 5$
Then you multiply everything by 3, getting

${(2 - 4d)}^{2} + 3 {d}^{2} = 15$
And then

$2 - 4d + \sqrt{3} d = \sqrt{15}$
Leaving
$d( \sqrt{3} - 4) = \sqrt{15} - 2$
I dont have a calc with me right now but you just pot this into the calculator:
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$c = \frac{2 - 4 \frac{ \sqrt{15} - 2}{ \sqrt{3} - 4} }{3}$

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makvit [3.9K]

Answer:

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Step-by-step explanation:

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