Question

y²-49/64=0
(y-7/8)(y+7/8)

Answer 1

1)Y²-49/64=0

Y²-0,765625=0

Y²-49/64=0

64Y²-49=0

64Y²=49

Y=-7/8

Y=7/8

Y1=-7/8, Y2=7/8

2)(y-7/8)*(y+7/8)

(y-0,875),(y+0,875)

Yкв2-0,875кв2

Yквадрате2-(7/8)кв2

Yкв2-49/64