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Solve x^2-4=77 E2020
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1 vote
Solve

x^2-4=77

E2020

User Jacqui Gurto
by
4.5k points

2 Answers

2 votes

Answer:

Explanation:

Solve x^2-4=77 E2020-example-1
User Kokosing
by
4.2k points
2 votes

Answer:

x = 9 or x = -9

Explanation:

x² - 4 = 77

then

x² - 4 + 4 = 77 + 4

then

x² = 81

then

x² - 81 = 0

then

x² - 9² = 0

then

(x - 9)(x + 9) = 0

then

x - 9 = 0 or x + 9 = 0

then

x = 9 or x = -9

__________________________

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User Mike Asdf
by
4.2k points
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