At an electronic store, an air conditioner marked at 280$ was on sale at $259 what was the percentage of discount for the air co
1 answer:
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Answer:
x = ± 5
Step-by-step explanation:
x² - 25 = 0 ( add 25 to both sides )
x² = 25 ( take square root of both sides )
x = ± = ± 5
That is x = - 5, x = 5