Which pair of numbers has an LCM of 20? 1. 4 and 5 2.5 and 10 3. 2 and 10

Mathematics

1 answer:

Rainbow [258]3 years ago

8 0

Answer:

3. 2 and 10

Step-by-step explanation:

let me know if im wrong

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vovikov84 [41]

$7x^2 + 21 = 0\\\\7x^2 = -21\\\\x^2 = -\frac{21}{7}\\\\x^2 = -3\\\\x = \sqrt{-3}\\\\\boxed{\bf{x = i\sqrt{3}}}\\\\\boxed{\bf{x=-i\sqrt{3}}}$

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2 years ago

What is the ultimate goal when solving equations? What do you want your final answer to look like?

STALIN [3.7K]

Answer:

$\huge\boxed{\text{To get x on one side of the equation:} \ \ x = ...}$

Step-by-step explanation:

When we solve for an equation, our goal is to find the value of the variable. Any variable can be used, but for the time being let’s assume we use $x$ .

We can algebraeically solve equations until we get the value of x - in which we will have x equal to something.

Say we have the equation $5x+5=20$ . Our goal is to find the value of $x$ . <u>We can do this by getting x isolated on one side so we have something equal to x</u>.