What are the solutions to the quadratic equation x2 – 16 = 0?
x= 2 and x = -2
x = 4 and x = -4
x = 8 and x = -8
x = 16 and x = -16

x = +4 or x = -4

Step-by-step explanation:

x² – 16 = 0

using bi formula

-b ± (√b² -4ac)/2a

where a=1, b=0, c=-16 from the equation above

-(0) ± (√(0)² - 4 x1x-16)/2x1

= ± (√64)/2

= ± 8/2

= ± 4

∴ x = +4 or x = -4

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answer: it's upside down and i can't read it

step-by-step explanation: