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Ahat [919]
3 years ago
6

What is (x+2)(x-2) equal ?

Mathematics
2 answers:
belka [17]3 years ago
8 0

Answer:

x^2 - 4

Step-by-step explanation:

since it is in the form of

a^2 - b^2 = (a + b)(a - b)

u can directly write x^2 - 2^2

=x^2 - 4

process :

(x + 2)(x - 2)

=x(x - 2) + 2(x - 2)

=x^2 - 2x + 2x - 4

=-2x and plus 2x gets cancel

=x^2 - 4

gizmo_the_mogwai [7]3 years ago
7 0
(x - 4)^2 , i hope this helps
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3 years ago
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(a) An article in a medical journal suggested that approximately 14% of such operations result in complications. Using this esti
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This question is incomplete, the complete question is;

Surgical complications: A medical researcher wants to construct a

99.5% confidence interval for the proportion of knee replacement surgeries that result in complications.

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Step-by-step explanation:

Given that;

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Therefore , a sample of operations needed is 149

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2 years ago
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