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jeka57 [31]
3 years ago
7

Solve the equation x + 5 = 12. Show and justify each

Mathematics
1 answer:
Vladimir [108]3 years ago
8 0

Answer:

Step-by-step explanation:

x+5= 12

 -x        -x

5=12-x

divided by 5

y= -5x+2.4

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64 POINT QUESTION<br><br> √(5-2x) - √(2-x) = 1
Ivanshal [37]

Answer:

x = 2 and x = -2

Step-by-step explanation:

The easiest way is to guess. We know that you can't have a square root of a negative number. This constrains x between negative infinity to 2. Testing 2 and -2, we see that it satisfy the equation.

The more systematic approach is shown below

\sqrt{5-2x}-\sqrt{2-x}=1 \\\sqrt{5-2x}-\sqrt{2-x}+\sqrt{2-x}=1+\sqrt{2-x} \\\sqrt{5-2x} = 1+\sqrt{2-x}

5-2x=(1+\sqrt{2-x})^2\\5-2x=1+2\sqrt{2-x}+2-x\\2-x=2\sqrt{2-x}\\1-0.5x=\sqrt{2-x}\\(1-0.5x)^2=2-x\\1-x+0.25x^2=2-x\\0.25x^2-1=0\\0.25x^2 = 1\\x^2 = 4\\x = +/-2

x= -2, 2

7 0
3 years ago
What 91 square root divided by 34 multiplied by 5
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The square root of 9 is 3, and 3 divided by 34 and multiplied by 5 is <span>0.44117647058. You would have to use a calculator for this and that's what I did. I hoped I helped!</span>
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Step-by-step explanation:

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