Step-by-step explanation:
4) y²-1=48
y²=49
y=±7
option C -7 and 7
5) x²=289
x=±17
-17 and 17
Answer:
hello :
y²-1=48
y²-49=0
y²-7² =0
(y-7)(y+7)=0
y-7=0 or y+7 =0
y=7 or y = -7
