Question

Which of the following could be a solution to......

$x^{2\ }=\ 400$

Answer 1

Answer:

20, -20

Explanation:

Answer 2

Answer:

x = ±20

Explanation:

x² = 400

Taking square root on both sides :

• √x² = √400
• x = √(20 × 20)
• x = √20²
• x = ±20