Question

a) x²- 5x = 0
b) - 2x² - 10x = 0
c) 3x²/4 - 5x = 0
d) 6x² = 5x
e) (x + 2 )² = 4

Answer 1

a)x²-5x=0
a=1 b=-5 c=0
∆=b²-4 .a.c
∆=(-5²) -4 (1).(0)
∆=25-0
∆=25

x=-b+ou-√∆\2.a
x=-(-5)+ou-√5\2.(1)
x¹= 5+5\2=10\2=5
x²=5-5\2 =0
S=[5,0]