Diana.xL
  • Diana.xL
http://prntscr.com/8icsqs
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Diana.xL
  • Diana.xL
@hartnn
hartnn
  • hartnn
16 is the square of which number?
Diana.xL
  • Diana.xL
4

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hartnn
  • hartnn
yeah so we have \(x^2-4^2 \) use the formula \(\Large a^2-b^2 = (a+b)(-b)\) so \(x^2-4^2 = ...?\)
Diana.xL
  • Diana.xL
my answer would be c?
imqwerty
  • imqwerty
no
zzr0ck3r
  • zzr0ck3r
HINT: this is the exact same question as last time
Diana.xL
  • Diana.xL
its b
imqwerty
  • imqwerty
u can write that as \[x^2-4^2\] nd then use the identity\[a^2-b^2=(a+b)(a-b)\]
zzr0ck3r
  • zzr0ck3r
correct
Diana.xL
  • Diana.xL
Thanks!
zzr0ck3r
  • zzr0ck3r
\(x^2-16=0\implies x^2=16\implies x=\pm\sqrt{16}=\pm4\)
zzr0ck3r
  • zzr0ck3r
remember, that when you induce the square you get two answers.
zzr0ck3r
  • zzr0ck3r
what I mean by that is that when you have x^2=16 you get two answers, but if I ask you what sqrt(16) is, then it is 4
Diana.xL
  • Diana.xL
oh ok ty

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