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storchak [24]
3 years ago
13

Which of the following polynomials represent a difference of squares?

Mathematics
1 answer:
valina [46]3 years ago
5 0

\text{A difference of squares:}

a^2-b^2

x^2-6\qquad NOT\\\\2x^2-9=2x^2-3^2\qquad NOT\\\\4x^2-16=2^2x^2-4^2=(2x)^2-4^2\qquad YES\\\\9x^2+25=3^2x^2+5^2=(3x)^2+5^2\qquad NOT\qquad \text{it's a sum of squares}


\text{A difference of cubes:}

a^3-b^3

x^3-9=x^3-3^2\qquad NOT\\\\x^2+27=x^2+3^3\qquad NOT\qquad\text{it's a sum of cubes}\\\\8x^3-1=2^3x^2-1^3=(2x)^3-1^3\qquad YES\\\\16x^3-27=2^4x^3-3^3\qquad NOT

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Answer:

4/16

Step-by-step explanation:

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4 years ago
Fourteen out of 20 teens said they eat breakfast every morning what is a reasonable prediction for the number of teens out of 12
Oksi-84 [34.3K]

Answer:

896

Step-by-step explanation:

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= 0.7 x 100%

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So, 70% of 20 teens eat breakfast every morning.

The reasonable prediction for the number of teens that eats breakfast every morning from 1280 teens will be 70% of 1280.

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The prediction would be 896 out of 1280 teens eats breakfast every morning

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3 years ago
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a. 7

Explanation:
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