Functions Formulas

What are Functions?

IN mathematics, function typically describes the link between the input and the output. Function Formulas are basically used to find out the x-intercept, y-intercept and slope in any function. For a quadratic function, you can also compute its vertex using the function formula. Also, the function can be sketched out in a graphical representation for different values of x. The functions formula seems in the formula bar as f(x)= B2 + C2

How to Solve Functions

The x-intercept of a function is computed by substituting the value of f(x) as zero (0).In the same manner, the y-intercept of a function is computed by substituting the value of x is zero (0). The slope of a linear function is typically identified by rearranging the equation to its standard form, f(x) = mx + c; Where, m = the slope.

We could also find out the vertex of a quadratic function by rearranging the equation to its standard form, f(x) = a(x – h)2 + k; where (h, k) represents the vertex.

Functions And Linear Equations

If we in the given equation y = x+3 allot a value to x, the equation will provide us with a value for y. For Example, 

y = x + 3

If x = 5, then

y = 5 + 3 = 8

Using Functions

There are a wide variety of functions in algebraic mathematics. Here are some of the functions we most commonly use:

  1. SUM: This function sums up all the values of the cells in the argument.

  2. COUNT: This function is used to count the number of cells having numerical data in the argument. This function is apt for counting items in a cell range quickly.

  3. AVERAGE: This function identifies the average of the values involved in the argument. It computes the sum of the cells and then specifically divides that value by the number of cells in the argument.

  4. MIN: This function identifies the lowest cell value involved in the argument.

  5. MAX: This function identifies the greatest cell value involved in the argument.

  6. SQRT: It identifies the square root of the value in cell D10. For example SQRT (D10)

  7. TODAY: It gets back to the current date (leaving the parentheses empty). For example, TODAY ()

Solved Examples Using Functions Formulas

Example: Find out the slope, x-intercept and y-intercept of a linear equation, with the values given as f(x) = 6x + 5.



f(x) = 6x + 5

The standard form of a linear equation is as given:

f(x) = mx + c


Slope = m = 6

Now, Substitute f(x) = 0,

0 = 6x + 5

6x = -5

x = −5/6

The x-intercept is (−5/6, 0)

Now, Substituting x = 0,

f(x) = 6(0) + 5

f(x) = 0 + 5

f(x) = 5

The y-intercept is (0, 5).

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FAQs (Frequently Asked Questions)

1. What is a Formula?

Answer: A formula is an equation that gives rise to calculations based on the numerical data in the spreadsheet. Formulas are basically entered into a cell in the excel worksheet. They must start with an equal sign (=), subsequent to the addresses of the cells that will be computed upon, with a suitable operand placed in between. Once the formula of the function is typed into the cell, the computation executes instantly.

2. What are Formulas and Functions?

Answer: A formula in an Excel spreadsheet can be defined as an expression that calculates the value of a cell. Functions, on the other hand, are predefined formulas that are already available in Excel. A significant characteristic of the Excel spreadsheet program is that it enables us to form formulas that will allow us to automatically calculate results. IN absence of formulas, a spreadsheet is not more than a huge table for displaying text.