Question

d) x2 + 16 = 0
e) 9x"=25
1) x2 - 20 = 0​

Answer 1

d) x2 + 16 = 0

x . 2 = 0 - 16

x = -16 : 2

x = -8

e) 9x =25

x = 9/25(Decimal 2.77777)

1) x2 - 20 = 0

x . 2 - 20 + 20 = 0 + 20

x = 20 : 2

x = 10