How do you solve using the square root property: 2x2 – 35 = 15 ?

Question

How do you solve using the square root property: 2x2 – 35 = 15 ?

Answer 1

2x^2 - 35 = 15 (add 35 to both sides)

2x^2 = 50 (divide both sides by 2)

x^2 = 25 (square root both sides)

x = 5, -5 <===ANSWER

Answer 2

2x^2 - 35 = 15 (add 35 to each side)

2x^2 = 50 (divide by 2)

x^2 = 25 (square root each side)

x = -5 or 5

The important thing to remember when using the square root property is to have the square equal both negative and positive numbers. If you think about it, -5 * -5 = 25 just the same as 5 * 5 = 25. Since you do not know which it was to get the answer 25, you must include both in your answer. Make sure not to say 5 AND -5. It can be either, but not both. Thus, say 5 or -5.

Hope this helps. You'll find other ways to answer this type of equation later. ^_^

Answer 3

2X^2-35=15

2X^2=15+35

2X^2=50

X^2=50/2= 25

X^2= 25

therefore X= +5 or -5