Question

2x²=18
10x²=1000
x²=400
625=x²​

Answer 1

A) 2x²=18

x²= 18/2

x²= 9

x= ± √9

x= ± 3

S= ( 3 , - 3)

B) 10x²=1000

x²= 1000/10

x²= 100

x= ± √100

x= ± 10

S= ( 10 , - 10)

C) x²=400

x= ± √400

x= ± 20

S= ( 20 , - 20)

d) 625=x²

x= ± √625

x= ± 25

S= ( 25 , - 25)