- #1
askor
- 169
- 9
Is it true that ##\frac{|a|}{|b|} = |\frac{a}{b}|## and ##|a| < |b| = a^2 < b^2##?
askor said:##|a| < |b| = a^2 < b^2##?
etotheipi said:Do you mean ##|a| < |b| \iff a^2 < b^2##?
romsofia said:Define ##|x| = \sqrt{x^2}##. Can you use certain properties of the square root to show that ##\frac{|a|}{|b|} = |\frac{a}{b}|##?
$$\frac{|a|}{|b|} = \frac{\sqrt{a^2}}{\sqrt{b^2}} = \sqrt{\frac{a^2}{b^2}} = \sqrt{\left(\frac{a}{b}\right)^2} = \dots$$askor said:I don't understand. Please tell me the point.
Absolute value is a mathematical concept that represents the distance of a number from zero on a number line. It is always a positive value, regardless of the sign of the number.
To calculate the absolute value of a number, you simply remove the negative sign (if present) and keep the positive value. For example, the absolute value of -5 is 5, and the absolute value of 5 is also 5.
Absolute value and modulus are often used interchangeably, but they have slightly different definitions. Modulus is the remainder when a number is divided by another number, while absolute value is always a positive value.
When solving equations with two absolute values, you need to consider both positive and negative cases. You can rewrite the equation as two separate equations, one with the positive value and one with the negative value, and then solve for both cases.
Absolute value with two abs values is commonly used in physics and engineering to calculate distances, velocities, and accelerations. It is also used in economics to calculate profit and loss, and in statistics to calculate deviations from the mean.