3 years ago

What are the solutions to the equation x2 − 1 = 399?

Mathematics

2 answers:

Mila [183]3 years ago

8 0

Answer:A

Step-by-step explanation:

mihalych1998 [28]3 years ago

3 0

Good evening ,

Answer :

x = ±20

Step-by-step explanation:

x² − 1 = 399 ⇔ x²= 400 ⇌ x² = 20² ⇌ x² − 20² = 0 ⇌ (x-20)(x+20) = 0

⇌ x = 20 or x = -20.

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