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Alina [70]
3 years ago
12

X2 + 2 – 42 = 0. Solve quadratic equation

Mathematics
2 answers:
kari74 [83]3 years ago
6 0

Answer:

2\sqrt{10}, -2\sqrt{10}

Step-by-step explanation:

(x^2) + 2 - 42 = 0

(x^2) - 40 = o

x =± \sqrt{40\\}

x =± 2\sqrt{10}

Therefore x = 2\sqrt{10}, -2\sqrt{10},

grigory [225]3 years ago
4 0

Answer:

-2√10, 2√10

Step-by-step explanation:

Graphing x²-40 would be the fastest way to go. However, because this is not factorable, you have to use the quadratic formula to solve it if you want to do it algebraically.

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A car is traveling at 50 ​mi/hour.<br> What is the​ car's speed in feet per​ second?
Sholpan [36]
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You don’t know how you gonna I was just tryna was the night you before you left I was just gonna let you know I’m going to be doing a lot better I don’t p you can
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3 years ago
A tree that is 6 feet tall is growing at a rate of 2 feet every year. A tree that is 12 feet tall is growing at a rate of foot e
kompoz [17]

Answer:

6 years

Step-by-step explanation:

let x = # of years

6 + 2x = 12 + x

x = 6

6 0
2 years ago
Help please been stuck on this for a week.
Anettt [7]
They give the formula as:
Surface Area =<span> (2 • <span>π <span>• r²) + (2 • <span>π • r • height)</span></span></span></span>
However the 2*PI*r^2 part of the formula is used to calculate the 2 "ends" of a cylinder.  Since the problem states that you are NOT to count any of surface area of the "ends" then you only need the <span>(2 • <span>π • r • height) part of the formula.
So, r = 3 inches and height = 8 * 3 inches, the side area equals
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2 * 3.14159 * 3 * 24 =
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6 0
3 years ago
A vender sold a combined total of 131 sodas and hot dogs. The number of hot dogs sold was 31 less than the number of sodas sold.
puteri [66]

Answer:

81 sodas and 50 hotdogs

Step-by-step explanation:

131 = x + x - 31

131 <em>+</em><em> </em><em>3</em><em>1</em><em> </em>= x + x - 31 <em>+</em><em> </em><em>3</em><em>1</em>

162 = x + x

x = 81

131 = 81 + (81 - 31)

131 = 81 sodas + 50 hot dogs

5 0
3 years ago
Solve each equation by factoring x^2+4x+4=0 ​
makkiz [27]

Answer: x = -2

<u>Step-by-step explanation:</u>

Find 2 numbers whose product is the c-value of 4 and their sum is the b-value of 4.

x² + 4x + 4 = 0

              ∧

           1 + 4 = 5  

           2 + 2 = 4  <em>this works!</em>   <em>so the factors are: </em>

(x + 2)(x + 2) = 0

x + 2 = 0      and      x + 2 = 0

     x = -2      and             x = -2  --> <em>same answer so only need to list it once</em>

6 0
3 years ago
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