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3 years ago

X2 + 8x = 15 help me

Mathematics

2 answers:

dangina [55]3 years ago

5 0

Answer:1.5

Step-by-step explanation:10x=15

x=15/10

x=1.5

svlad2 [7]3 years ago

3 0

Answer:

x₁ = - 4 + √31

x₂ = - 4 - √31

Step-by-step explanation:

x² + 8x = 15

x² + 8x - 15 = 0

x = [- 8 ± √8² - 4×1×(-15)]/(2×1)

x = (-8 ± 2√31)/2

x₁ = (-8 ± 2√31)/2

x₁ = - 4 + √31

x₂ = - 4 - √31

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3 years ago

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2 years ago

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Elena-2011 [213]

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6 0

3 years ago

****ASAP*****<br> can someone pls help me with this? and can you describe it please?

Studentka2010 [4]

Add 165 to 245. That is a total of 410kWh.

245kWh is more than 50% of 410kWh.

So, according to the plan, you will pay NightTimer rate for kWh at night and DayTimer rate during the day.

The work done:

$(165*0.05281)+(245*0.05456)\\8.71365+13.3674=22.08085$

The raw, accurate, answer is that the value to pay is $22.08085.

In real terms, it is closer to your $22.08 option. That is the one I'd take.

5 0

3 years ago

X2 + 8x = 15 help me ​

X2 + 8x = 15 help me