Answer:
x = ±sqrt(7)
Explanation:
3x^2 + 7 = 28
Subtract 7 from each side
3x^2 + 7-7 = 28-7
3x^2 = 21
Divide by 3
3x^2 /3 = 21/3
x^2 = 7
Take the square root of each side
sqrt(x^2) = ±sqrt(7)
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