Answer:
see explanation
Step-by-step explanation:
2x² - 7 = 9 ( add 7 to both sides )
2x² = 16 ( divide both sides by 2 )
x² = 8 ( take square root of both sides )
x = ± [tex]\sqrt{8}[/tex] ← exact values
This method is useful when there are only numeric values to deal with
