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3 years ago

Solve the equation for all values of x by completing the square. x2 + 8.0 + 15 = 0

Mathematics

1 answer:

Aleonysh [2.5K]3 years ago

6 0

Answer:

x= -3

x= -5

Step-by-step explanation:

x^2 + 8x + 15 = 0

find which 2 numbers when multiplied equal 15 and when added equal 8

they are 3 and 5

(x+3)(x+5)

x+3 =0

x+5=0

x= -3

x= -5

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(-8/5)+1/2 A) 2/5 B) -4 23/30 C) 3/20 D) -1 1/10

m_a_m_a [10]

Answer:

$-1\frac{1}{10}$

Step-by-step explanation:

$-\frac{8}{5} +\frac{1}{2}$

→ Make a common denominator

$-\frac{16}{10} +\frac{5}{10}$

→ Simplify

$-\frac{11}{10}$

→ Convert into mixed number

$-\frac{11}{10}=-1\frac{1}{10}$

8 0

3 years ago

Hello I'm Chloe, Can you Help me, Thank you so much. How many times does 346 go into 100,356?

Irina-Kira [14]

Answer:

It goes into 100356 290 times with a remainder of 16

Step-by-step explanation:

100356/346 = 290 R 16

5 0

3 years ago

3x + 18.45 = 1850.00

elixir [45]

Answer:

$\frac{1831.55}{3}$

Step-by-step explanation:

Subtract 18.45 from each side: 3x = 1831.55
Divide each side by 3 to cancel out the 3 next to x. It should now look like this: $x = \frac{1831.55}{3}$

I hope this helps!

6 0

4 years ago

xP(x)00.2510.0520.1530.55Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal pl

Nookie1986 [14]

The Solution:

Given:

Required:

Find the standard deviation of the probability distribution.

Step 1:

Find the expected value of the probability distribution.

$E(x)=\mu=\sum_{i\mathop{=}0}^3x_iP_(x_i)$ $\begin{gathered} \mu=(0\times0.25)+(1\times0.05)+(2\times0.15)+(3\times0.55) \\ \\ \mu=0+0.05+0.30+1.65=2.0 \end{gathered}$

Step 2:

Find the standard deviation.

$Standard\text{ Deviation}=\sqrt{\sum_{i\mathop{=}0}^3(x_i-\mu)^2P_(x_i)}$ $=(0-2)^2(0.25)+(1-2)^2(0.05)+(2-2)^2(0.15)+(3-2)^2(0.55)$ $=4(0.25)+1(0.05)+0(0.15)+1(0.55)$ $=1+0.05+0+0.55=1.60$

Thus, the standard deviation is 1.60

Answer:

1.60

8 0

2 years ago

What is the measure of angle x

yKpoI14uk [10]

102 + 31 = 133
180 - 133 = 47

Your missing angle is 47.

Hope this Helps!!
Good Luck!!

6 0

3 years ago

Read 2 more answers