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Answer:
x = ± [tex]\sqrt{7}[/tex]
Step-by-step explanation:
3x² + 7 = 28 ( subtract 7 from both sides )
3x² = 21 ( divide both sides by 3 )
x² = 7 ( take square root of both sides )
x = ± [tex]\sqrt{7}[/tex]
that is x = - [tex]\sqrt{7}[/tex] , x = [tex]\sqrt{7}[/tex]
Answer:
A. +[tex]\sqrt{7}[/tex]
Step-by-step explanation:
3x^2+7=28
3([tex]+\sqrt{7} ^{2}[/tex] )+7=28
3(7)+7=28
21+7=28
28=28
Hope it helps