Solve the equation by using square roots. 2 x 2 − 9 = 11

Mathematics

1 answer:

VashaNatasha [74]3 years ago

3 0

Answer:

x = ± $\sqrt{10}$

Step-by-step explanation:

Given

2x² - 9 = 11 ( add 9 to both sides )

2x² = 20 ( divide both sides by 2 )

x² = 10 ( take the square root of both sides )

x = ± $\sqrt{10}$ ← exact solutions

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