anonymous
  • anonymous
What is the value of x, when x2 + 5 = 21? A) 2 or -2 B) 4 or -4 C) 5.5 or -5.5 D) 8 or -8 @itzhannahx
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1446254299284:dw|
anonymous
  • anonymous
B.
anonymous
  • anonymous
B

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anonymous
  • anonymous
If you substituted 4 or -4 in for x, the answer would equal 21.
anonymous
  • anonymous
|dw:1446254324466:dw|
anonymous
  • anonymous
\[x^2=21-5=16\] \[x^2-16=0,\left( x+4 \right)\left( x-4 \right)=0,x=?\]
anonymous
  • anonymous
Actually -4 wouldn't work, are you sure that it isn't an absolute value equation?
anonymous
  • anonymous
Because if it is, you must know how to answer these, as they are very important.

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