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Gala2k [10]
4 years ago
14

Find f(-7) if f(x) = 2x + 8.A. -6 B. 2 C. 3 D. 22​

Mathematics
1 answer:
spayn [35]4 years ago
7 0
To find f(-7), just plug -7 in for all x

2(-7) + 8
-14 + 8
-6 is the answer!
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Y=6x4 + 7x2 and x = vw +1
belka [17]

Answer:

w=-1/6 or w=-3

Step-by-step explanation:

Substitute the value of x and y into the first equation and solve for w:

y=6x^4+7x^2\\10=6(\sqrt{w+1})^4+7(\sqrt{w+1})^2\\10=6(w+1)^2+7(w+1)\\10=6(w^2+2w+1)+7w+7\\10=6w^2+12w+6+7w+7\\0=6w^2+19w+3

Solve for w with the quadratic formula:

w=\frac{-b\±\sqrt{b^2-4ac}}{2a} \\w=\frac{-19\±\sqrt{19^2-4(6)(3)} }{2(6)}\\w=\frac{-19\±\sqrt{361-72}}{12} \\w=\frac{-19\±\sqrt{289} }{12} \\w=\frac{-19\±17}{12}

After simplifying, we get either w=-1/6 or w=-3.

Not sure if w needs to satisfy all conditions while maintaining everything as real numbers, because if w=-3, then x is an imaginary number. But both values work just as fine.

4 0
2 years ago
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Lisa [10]
The answer is for that problem is -3

8 0
4 years ago
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The surface area is 174
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If Logan's family can drive 23 1/8 miles on 1 gallon of gas,how far can they drive on 17 gallons
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4 0
3 years ago
Which is greater 1 gal or 100 fil oz
asambeis [7]
<span>Gallons because 1 gallon is 128 fl oz and you already know that 128 is greater than 100</span>
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