GROWTH(known_y's [,known_x's] [,new_x's] [,const]) 
Returns the predicted exponential growth using existing data. 
known_y's  The array of yvalues you know in the relationship y = b*m^x. 
known_x's  (Optional) The array of xvalues that you know in the relationship y = b*m^x. 
new_x's  (Optional) The new xvalues for which you want yvalues for. 
const  (Optional) True or False to indicate whether to force the constant b to equal 1: True = b is calculated normally (default) False = b is equal to the value 1 
Remarks 
* This function can return an array. * If "known_y's" is in a single column, then each column of known_x's is interpreted as a separate variable. * Calculates predicted exponential growth by using existing data. This function returns the yvalues for a series of new xvalues that you specify by using existing xvalues and yvalues. You can also use the GROWTH worksheet function to fit an exponential curve to existing xvalues and yvalues. * If "known_y's" is in a single row, then each row of "known_x's" is interpreted as a separate variable. * If any of the numbers in "known_y's" is 0 or negative, then #NUM! is returned. * The "known_x's" can include one or more sets of variables. If only one variable is used, known_y's and known_x's can be ranges of any shape, as long as they have equal dimensions. If more than one variable is used, known_y's must be a vector (that is, a range with a height of one row or a width of one column). * If known_x's is omitted, it is assumed to be the array {1,2,3,} that is the same size as known_y's. * The "new_x's" must include a column (or row) for each independent variable, just as known_x's does. So, if known_y's is in a single column, known_x's and new_x's must have the same number of columns. If known_y's is in a single row, known_x's and new_x's must have the same number of rows. * If "new_x" is left blank, it is assumed to be the same as known_x's. * If "known_x's" and "new_x's" are left blank, they are assumed to be the array {1,2,3,} that is the same size as known_y's. * If "const" = True, then b is calculated normally. * If "const" = False, then b is set equal to 1 and the mvalues are adjusted so that y = m^x. * If "const" is left blank, then True is used. * Formulas that return arrays must be entered as array formulas after selecting the correct number of cells. For more information about entering array formulas, click . * When entering an array constant for an argument such as known_x's, use commas to separate values in the same row and semicolons to separate rows. * For the Microsoft documentation refer to support.office.com 

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