Question

a)a↑2-25 b)x↑2-1 c)9-x↑2 d)4x↑2-25

Answer 1

a)

a² -25=0
a² =25
a=±√25
a=±5

b)
x²-1=0
x²=1
x=±√1
x=±1

c)
9 -x²=0
-x²= -9
x²=9
x=±√9
x=±3

d)
4x²-25=0
4x²=25
x=±√25/4
x=±5/2

Answer 2

a)a↑2-25 = 0 => a↑2 = 25 ==> a = +/- 5

b)x↑2-1 = 0 => x↑2 = 1 ==> x = +/- 1

c)9-x↑2 = 0 => x↑2 = 9 ==> x = +/- 3

d)4x↑2-25 = 0 => x↑2 = 25/4 ==> x = +/- 5/2