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Phổ biến Word Problems >

The hiệu between two positive numbers is 7 and the square of their sum is 289 . Find the two numbers.

Lời Giải

T h e d i ff ere n ce b e tw ee n tw o p os i t i v e n u mb ers i s 7 an d t h e s q u a re o f t h e i r s u m i s 289 . F in d t h e tw o n u mb ers .

Lời Giải

The numbers : 12, 5

Các bước giải pháp

Represent the numbers with

x and y

:

number 1 : x

number 2 : y

A.T.Q.:

x - y = 7

(x + y)^{2} = 289

Giải hệ phương trình:

x - y = 7, (x + y)^{2} = 289 : (x = 12, x = - 5, y = 5 y = - 12)

Select positive solutions:

5, 12

The numbers : 12, 5

Ví dụ phổ biến

Train A and Train B are traveling in completely opposite directions. Train A is going 100 km per hour. Train B is going 200 km per hour. How long will it take them to be 900 km apart from each other?three more than twice a number is nine The product of 7 and a number, increased by 3 is equal to twice the number, subtracted from 39 Find the number.Twice a number is at least 15 when 5 is added to three more than a certain number, the result is 19. what is the number?