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Flura [38]
4 years ago
15

Solve for x.

Mathematics
2 answers:
jarptica [38.1K]4 years ago
6 0
Hi there! 5x²-45=0, add 45 to both sides, 5x²-45+45=0+45=5x²=45. Divide both sides by 5, 5x²/5=45/5, 45/5=9. So, we have x²=9. we have to find the square root of 9. The square root of 9 is 3*3 because 3*3=9. We have two solutions, the first solution is x=3 and the other solution is x=-3. X=3 and x=-3 can be combined and we get {3,-3}. Therefore, your answer is B. {3,-3}
LekaFEV [45]4 years ago
5 0
5x^2-45=0
factor 5 out
5(x^2-9)=0
diff 2 perfec squares
5(x-3)(x+3)=0
set zero
x-3=0
x=3

x+3=0
x=-3

x=-3 or 3

B
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Alvin's age is two times Elga's age. The sum of their ages is 24. What is Elga's age?
gulaghasi [49]
Alvin is 16 and Elga is 8.

16 is two times bigger than 8 and 16+8= 24
8 0
2 years ago
Read 2 more answers
Find the square Root of <br><img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B37%7D%20" id="TexFormula1" title=" \sqrt{37} " alt="
Zolol [24]

Answer:

\approx \frac{73}{12}\left(1 - \frac{1} {2\cdot73^2}\right)

Step-by-step explanation:

= \sqrt{\frac{73^2-1) 1}{12^2}} \\

= \sqrt{\frac{73^2}{12^2}\cdot\frac{73^2-1}{73^2}} \\

= \sqrt{\frac{73^2}{12^2}}\sqrt{\frac{73^2-1}{73^2}}\\

=\frac{73}{12}\sqrt{1 - \frac{1}{73^2}} \\

\approx \frac{73}{12}\left(1 - \frac{1} {2\cdot73^2}\right)

8 0
3 years ago
I did help on this question
Advocard [28]

Answer:

6/7

Step-by-step explanation:

8 0
3 years ago
Mr. Fat needs 20 minutes to eat a pound of cereal, while Mr. Thin needs 30 minutes. If they eat together, how long does it take
marishachu [46]
36 minutes.

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4 0
4 years ago
a shopper 48 hot dogs the store sells identacal ht dogs in two diffrent sized packets the sell a six pack of hot dogs for 2.10 a
seraphim [82]

Answer:

The shopper should but the 6 pcs pack because its cheaper.

Step-by-step explanation:

6-pcs pack = $2.10

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number of 8 pcs packs = 48 divided 8= 6

total cost = $3.12 x 6 =$18.72

hope it helps :)

8 0
3 years ago
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