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3 years ago

Subtract: 3.8 - 2.923. Explain in your own words how you would solve this, in detail, from start to finish.

Mathematics

1 answer:

Cerrena [4.2K]3 years ago

4 0

Given:

The expression is 3.8 - 2.923.

To find:

The subtraction.

Solution:

We have,

$3.8-2.923$

It can be written as

$3.800-2.923$

Now,

3 . 8 0 0

-2 . 9 2 3

-----------------

0 . 8 8 7

-----------------

So, $3.800-2.923=0.887$

Therefore, the value of $3.800-2.923$ is 0.887.

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Step-by-step explanation:

we have

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<em>Alternative Method</em>

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$(u)^2+(u)-2=0$

$a=1\\b=1\\c=-2$

substitute in the formula

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<em>Find the solutions of the original equation</em>

For u=-2

$-2=(x+3)$ ----> $x=-2-3=-5$

For u=1

$1=(x+3)$ ----> $x=1-3=-2$

therefore

The solutions of the original equation are

x=-5 and x=-2

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