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3 years ago

15

An equation is shown below: 5(2x - 8) + 15 = -15 Write the steps you will use to solve the equation and explain each step. Need

Help asap, Will Mark Brainliest
<99 pts>

1 answer:

Ugo [173]3 years ago

3 0

Answer:

x = 1

Step-by-step explanation:

5 x (2x - 8) + 15 = -15 Multiply 5 by 2x and -8

10x - 40 + 15 = -15 Add -40 and 15

10x - 25 = -15 Add 25 to both sides

10x = 10 Divide 10 by 10

x = 1

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Step-by-step explanation:

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2 years ago

7.959 to one decimal place .

o-na [289]

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Find the discriminant and determine the nature of the roots to the quadratic equation

Katen [24]

№17
$x^{2} +6x-7=0 \\ D=6 ^{2} -4*(-7)=36+28=64=8 ^{2} \\ \\ x_{1} = \frac{-6+8}{2} =1 \\ \\ x_{2} = \frac{-6-8}{2} =-7$
Answer: x₁ = 1
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№18
$2 x^{2} -3x+4=3 \\ 2 x^{2} -3x+4-3=0 \\ 2 x^{2} -3x+1=0 \\ \\ D= -3 ^{2} -4*2=9-8=1 \\ \\ x_{1} = \frac{3+1}{2*2} = \frac{4}{4} =1 \\ \\ x_{2} = \frac{3-1}{2*2} = \frac{2}{4} =0.5$
Answer: x₁ = 1
     x₂ = 0,5.

№19
$2 x^{2} -4x-5=0 \\ D=-4 ^{2} -4*2*(-5)=16+40=56 \\ \\ x_{1}= \frac{4+ \sqrt{56} }{2*2} = \frac{4}{4} + \sqrt{ \frac{56}{16} } =1+ \sqrt{3.5} \\ \\ x_{2} = \frac{4- \sqrt{56} }{2*2} = \frac{4}{4} - \sqrt{ \frac{56}{16} } =1- \sqrt{3.5} 
$
Answer: x₁ = 1 + √3.5
     x₂ = 1 - √3.5

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4 years ago

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Eva8 [605]

Answer:

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Step-by-step explanation:

The answer is off by 30%, as the scale is off by 3 pounds. 3/10=30

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