Question

Resolva pelo método da soma e produto

a) x²-5x+6 = 0
b) x²-9x+12 = 0
c) x²+2x-8 = 0
d) 2x²-8x+8= 0
e) x²-4x-5= 0
f) -x²+x+12= 0
g) -x²+6x-5= 0
h) x²= x+12
j) x²+3x-6= -8

Answer 1

a=1, b=-5, c=6.
a) x²-5x+6=0
x=-b±√b²-4ac/2a
x=-(-5)±√(-5)²-4•1•6/2•1
x=5±√25-24/2
x=5±√1/2
x'=5+1/2=6/2=3
x"=5-1/2=4/2=2