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3 years ago

If log10x = 3, then x =

Mathematics

2 answers:

iren [92.7K]3 years ago

7 0

This is what WolframAlpha says. Look at the image below.

AleksandrR [38]3 years ago

5 0

Answer: 1000

Step-by-step explanation:

If log10x = 3 then x = 10^3 = 1000

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maks197457 [2]

Answer: it’s 2

Step-by-step explanation:

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3 years ago

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A: What are the solutions to the quadratic equation x2+9=0? B: What is the factored form of the quadratic expression x2+9? Selec

Paraphin [41]

Answer:

A. The solutions are $x=3i,\:x=-3i$ .

B. The factored form of the quadratic expression $x^2+9=(x-3i)(x+3i)$

Step-by-step explanation:

A. To find the solutions to the quadratic equation $x^2+9=0$ you must:

$\mathrm{Subtract\:}9\mathrm{\:from\:both\:sides}\\\\x^2+9-9=0-9\\\\\mathrm{Simplify}\\\\x^2=-9\\\\\mathrm{For\:}x^2=f\left(a\right)\mathrm{\:the\:solutions\:are\:}x=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}\\\\x=\sqrt{-9},\:x=-\sqrt{-9}$

$x=\sqrt{-9} = \sqrt{-1}\sqrt{9}=\sqrt{9}i=3i\\\\x=-\sqrt{-9}=-\sqrt{-1}\sqrt{9}=-\sqrt{9}i=-3i$

The solutions are:

$x=3i,\:x=-3i$

B. Two expressions are equivalent to each other if they represent the same value no matter which values we choose for the variables.

To factor $x^2+9$ :

First, multiply the constant in the polynomial by $i^2$ where $i^2$ is equal to -1.

$x^2+9i^2$

Since both terms are perfect squares, factor using the difference of squares formula

$a^2-i^2=(a+i)(a-i)$

$x^2+9=x^2+9i^2=\left(-3i+x\right)\left(3i+x\right)$

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3 years ago

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hoa [83]

90 mm ..................

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How to solve quadratic equations by completing the square problems?

babunello [35]

You don't solve a quadratic equation using completing the square

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3 years ago

Solve for m.<br><br> 774 = m − 15

lyudmila [28]

Answer:

$m = 789$

Step-by-step explanation:

$774 = m - 15 \\ 774 + 15 = m \\ 789 = m$

hope this helps

brainliest appreciated

good luck! have a nice day!

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3 years ago

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