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3 years ago

What's...factorise: 25x²-y²?

1 answer:

6 0

Factorising an equation is putting it into bracket form.
This has square numbers and so needs double brackets

(5x - y) (5x+y)
If you then check this by multiplying the brackets out again you will get:
5x^2 - 5xy + 5xy - y^2

The positive and negative 5xy's cancel each other out and you are left with its original form. Your answer is
(5x - y) (5x+y)

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1 year ago

(h) Suppose we sample a new city whose particulate is 13 ppm. If reasonable, create a 95% interval for the predicted rate of chi

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Explanation below

Step-by-step explanation:

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