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Which of the following are solutions to the following equation?
2x^2 - 98 = 0
(all that apply)
a) 7
b) - (square root of 7 )
c) - 7
d) (square root of 7)
5 Answers
- llafferLv 76 months agoFavorite Answer
2x² - 98 = 0
You can move the constant to the other side then divide both sides by 2:
2x² = 98
x² = 49
Now get the square root of both sides:
x = ±7
There are two solutions. Answers A and C.
- JimLv 76 months ago
2x^2 - 98 = 0
We want x = _____
rule: what you do to one side of the equal sign, you must do to both!
Add 98 ((I usually add/subtract first)):
2x² = 98
Divide by 2:
x² = 49
Take square root of both sides:
√x² = √49
x = 7, or x = -7 so (a) & (c) answers
Why both:
7² = 49
(-7)² = 49
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