Solve for x.

5x2 - 80 = 0

A.

{16, - 16}

B.

{16}

C.

{4}

D.

{4, - 4}

Question

Sullivan Collins

15 November, 09:49

+2

Answers (2)

Know the Answer?

Piggy · Answer 1

x = {-4, 4}

Divide each side by '5'. x2 = 16 Simplifying x2 = 16 Take the square root of each side: x = {-4, 4}

Zachery Henson · Answer 2

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}

Solve for x.5x2 - 80 = 0A.{16, - 16}B.{16}C.{4}D.{4, - 4}