Answer:
Step-by-step explanation:
y²-49= 0
(y+7) (y-7)=0
y= -7, y= 7
CHECKING:
= y²+7y-7y-49
= y²-49
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Answers & Comments
Answer:
A. ±7
Step-by-step explanation:
y²-49= 0
(y+7) (y-7)=0
y= -7, y= 7
CHECKING:
(y+7) (y-7)=0
= y²+7y-7y-49
= y²-49