Question

Me ajudem por favor.. Responda.

x²-7x+10=0

x²+2x-15=0

x²+12x+32=0

x²+6x-7=0

Answer 1

a) a=1 b=-7 c=10
Delta
-7²-4.1.10
49-40
9
-------------------------
X= (7+-3)/2
x¹= 10/2= 5
x²= 4/2= 2

b)a=1 b=2 c=-15
Delta
2²-4.1.-15
4+60
64
----------------------
X=(-2+-8)/2
x¹= 6/2 = 3
x²= -10/2= -5

c)a=1 b=12 c=32
Delta
12²-4.1.32
144-128
16
------------------------
X=( -12+-4)/2
x¹= -8/2= -4
x²= -16/2= -8

d)a=1 b=6 c=-7
Delta
6²-4.1.-7
36+28
64
-------------------------
X=(-6+-8)/2
x¹= 2/2 = 1
x²= -14/2= -7