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3 years ago

4. Solve. x² – 81 = 0 (1 point) 0 –9 –9, 9 9

Mathematics

2 answers:

astra-53 [7]3 years ago

7 0

Answer:

–9, 9

Step-by-step explanation:

x² – 81 = 0

Add 81 to each side

x² – 81+81 = 0+81

x^2 = 81

Take the square root of each side

sqrt(x^2) = ± sqrt(81)

x = ± 9

Rudik [331]3 years ago

5 0

x^2 - 81 = 0. Add 81 to each side.

x^2 = 81. Take the square root of each side.

x = 9, -9

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3 years ago

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cricket20 [7]

Hey ! there

Answer:

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Step-by-step explanation:

Question says that we have to write the simplest form of 85% as it's fraction .

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or ,

$\quad \longrightarrow \qquad \: \dfrac{85}{100}$

Reducing the fraction by cancelling it by 5 :

$\quad \longrightarrow \qquad \: \dfrac{ \cancel{85}}{ \cancel{100}}$

We get :

$\quad \longrightarrow \qquad \: \pink{\underline{\boxed{\frak{\dfrac{17}{20} }}}} \quad \bigstar$

Now , we can't reduce 17/20 .

Henceforth , 17/20 is the simplest form of 85% .

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2 years ago

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Helga [31]

Step-by-step explanation:

a+(a+60)=760

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2a+60=760

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Step-by-step explanation:

We must prove that triangles ABC and EDC are congruent.

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Since AE bisects BD, then BC is congruent with CD

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Being two sides and the included angle congruent, then both triangles are similar by the SAS theorem.

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Answer:

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Step-by-step explanation:

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