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grab0elisoracoslovi
grab0elisoracoslovi grab0elisoracoslovi
  • 07-06-2016
  • Mathematics
Answered

Solve for x.


5x2 – 80 = 0


A.

{16, –16}


B.

{16}


C.

{4}


D.

{4, –4}

Verified Answer :

Anonymous Anonymous
  • 07-06-2016

x = {-4, 4}

Divide each side by '5'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}

Answer Link
1Jr
1Jr 1Jr
  • 07-06-2016

Answer is D.

5x2 - 80 = 0
5x2 = 0+80
5x2 = 80
x2 = 80/5
x2 = 16
By taking sqr root of both sides, we get
x = 4 and x = -4

So, the answer is {4, –4}

Answer Link

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