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Popolare Word Problems >

the sum of two positive numbers is 7 times their differenza. the differenza of the squares of these numbers is twice the sum of the numbers. find these numbers

Soluzione

t h e s u m o f tw o p os i t i v e n u mb ers i s 7 t im es t h e i r d i ff ere n ce . t h e d i ff ere n ce o f t h e s q u a res o f t h ese n u mb ers i s tw i ce t h e s u m o f t h e n u mb ers . f in d t h ese n u mb ers

Soluzione

The numbers : 8, 6

Fasi della soluzione

Represent the numbers with

x and y

:

number 1 : x

number 2 : y

A.T.Q.:

x + y = 7 (x - y)

x^{2} - y^{2} = 2 (x + y)

Risolvi il sistema di equazioni:

x + y = 7 (x - y), x^{2} - y^{2} = 2 (x + y) : (x = 8, x = 0, y = 6 y = 0)

Select positive solutions:

6, 8

The numbers : 8, 6

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