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4 years ago

What's is the answer to 9+2× = 7

Mathematics

1 answer:

Harlamova29_29 [7]4 years ago

3 0

Answer:

$\displaystyle -1 = x$

Step-by-step explanation:

9 + 2x = 7

- 9 - 9

________

$\displaystyle \frac{2x}{2} = \frac{-2}{2} \\ \\ x = -1$

I am joyous to assist you anytime.

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Solve by using square root: <br> 4(x-1)^2+2=10

Scilla [17]

$4(x-1)^2+2=10\\\\4(x^2-2x+1)+2-10=0\\\\4 x^2-8x+4+2-10=0\\\\4 x^2-8x-4=0\ \ / :4\\\\x^2-2x-1=0\\\\x_{1}=\frac{-b-\sqrt{b^2-4ac}}{2a}=\frac{2-\sqrt{ (-2)^2-4*1*(-1)}}{2 }=\frac{2-\sqrt{ 8}}{2 }=\frac{2- \sqrt{ 4*2}}{2 }=\\\\=\frac{2-\sqrt{ 8}}{2 }=\frac{2(1- \sqrt{ 2})}{2 }=1- \sqrt{ 2}\\\\x_{2}=\frac{-b+\sqrt{b^2-4ac}}{2a}=\frac{2+\sqrt{ (-2)^2-4*1*(-1)}}{2 }=\frac{2(1+ \sqrt{ 2})}{2 }=1+ \sqrt{ 2}$

$Answer:\ x=1- \sqrt{2}\ \ or\ \ x= 1+ \sqrt{ 2}$

3 0

4 years ago

Read 2 more answers

Omani drives 66 miles in 1.5 hours

Burka [1]

Answer:

25.6 km/h

Step-by-step explanation:

Omani:

First, 1.5 hours = 1 hour and 30 minutes

and 66 miles = 105.6 km (66 x 1.6 = 105.6)

105.6 / 1.5 = 70.4 km/h

Omani's speed is 70.4 km/h

Adedi:

1 hour and 15 minutes is 1.25 hours

she drives 56 km in 1.25 hours

So 56 / 1.25 = 44.8 km/h

Adedi's speed is 44.8 km/h

Difference:

70.4 - 44.8 = 25.6 km/h

Omani is faster than Adedi with 25.6 km/h

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3 years ago

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Peopl3 what is x÷2=6.5

zloy xaker [14]

Answer:

X=13

Step-by-step explanation:

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3 years ago

What is the partial product of 2.3 x 2.6?

otez555 [7]

I’m pretty sure it’s 2.99

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3 years ago

65 - 14 = 65-5-______

Fed [463]

Answer: 60? to be hostens i have no clue sorry i hope this help...

Step-by-step explanation:

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3 years ago

What's is the answer to 9+2× = 7​

What's is the answer to 9+2× = 7