Which of the following equations shows the correct form of the equation x 2 + 10x + 25 = 16 if the zero product property is to be used? (x + 5)(x + 5) = 16 (x + 1)(x + 9) = 0 (x - 1)(x - 9) = 0

  (x + 1)(x + 9) = 0

Step-by-step explanation:

After you subtract 16 from both sides, you get ...

  x² +10x +9 = 0

When you factor this equation, it becomes ...

  (x +1)(x +9) = 0

For the zero product property to be of any use, the form of the equation must be a product that equals zero.

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Comment on the other answer choice

(x -1)(x -9) = 0 = x² -10x +9 . . . . . the x term is different from that in the given equation. It has the wrong sign.

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step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.