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Phổ biến Word Problems >

5 The product of two consecutive numbers is 72 . Use a quadratic equation to find the two sets of numbers.

Lời Giải

5 T h e p ro d u c t o f tw o co n sec u t i v e n u mb ers i s 72 . U se a q u a d r a t i c e q u a t i o n t o f in d t h e tw o se t s o f n u mb ers .

Lời Giải

The numbers : \frac{- 5 + 1465}{10}, \frac{- 5 + 1465}{10} + 1 or \frac{- 5 - 1465}{10}, \frac{- 5 - 1465}{10} + 1

Các bước giải pháp

Represent the numbers with

x

:

First number : x

Consecutive number : x + 1

A.T.Q.:

5 x (x + 1) = 72

Giải

5 x (x + 1) = 72 : x = \frac{- 5 + 1465}{10}, x = \frac{- 5 - 1465}{10}

Thay

x = \frac{- 5 + 1465}{10} : \frac{- 5 + 1465}{10} + 1

Thay

x = \frac{- 5 - 1465}{10} : \frac{- 5 - 1465}{10} + 1

The numbers : \frac{- 5 + 1465}{10}, \frac{- 5 + 1465}{10} + 1 or \frac{- 5 - 1465}{10}, \frac{- 5 - 1465}{10} + 1

Ví dụ phổ biến

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