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juin [17]
2 years ago
5

If f(x) = 2x2 - x, find f(-3).

Mathematics
2 answers:
jonny [76]2 years ago
7 0
F(x) = 2x^2 - x
if x=-3

f(-3) = (2*(-3)^2) - (-3)
f(-3) = (2*9) + 3
f(-3) = 18 + 3
f(-3) = 21
Sergio [31]2 years ago
7 0

Answer: 21

Step-by-step explanation: because i got it right

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Michael and Lindsey are saving money. Michael begins with $20 and saves $5 per week. Lindsey begins with no money, but saves $10
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Let
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we now that

<span>Michael begins with $20 and saves $5 per week
so
y=20+5x------> equation 1

and
</span><span>Lindsey begins with no money, but saves $10 per week
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</span><span>the number of weeks it will take for Lindsey and Michael to save the same amount of money is when equation 1 is equals to equation 2
</span>
therefore
20+5x=10x------> 10x-5x=20------> 5x=20-----> x=20/5-----> x=4 weeks

the answer is 
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2 years ago
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