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4 votes
2x squared minus 1 equals 21​

2 Answers

4 votes

Answer:

x = √11

Step-by-step explanation

2x² - 1 = 21

negative sign crossing an equal to sign becomes a positive sign

2x² - 1 = 21 + 1

2x² = 22

x² = 22 / 2

x = √11

User Patter
by
8.4k points
3 votes

Answer:

x = √11

Explanation:

2x² - 1 = 21

add 1 to both sides

2x² - 1 + 1 = 21 + 1

simplify

2x² = 22

x² = 22 / 2

x = √11

User Madhushankarox
by
9.1k points

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