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Popular Word Problems >

A certain positive number, plus its square, minus 72, equals 0. Find the number.

Solution

A cer t ain p os i t i v e n u mb er, pl u s i t s s q u a re, min u s 72, e q u a l s 0. F in d t h e n u mb er .

Solution

The number : 8

Solution steps

Represent the number with

x

A.T.Q.:

x + x^{2} - 72 = 0

Solve for

x, x + x^{2} - 72 = 0 : x = 8, x = - 9

Select positive solutions:

8

The number : 8

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