Question

Como resolver:(a+1) (a+2)
(r+5) (r-3)
(X+3) (X+4)
(y+2) 2
(X+6) (x-6)

Answer 1

(a+1).(a+2)
a^2+2a+a+2
a^2+3a+2=0
delta=b^2-4ac
delta=3^2-4.1.2
delta=9-8
delta=1
a=-b-/+ raiz de delta/2a
a=-3-1/2.1
a=-4/2
a=-2
a=-3+1/2.1
a=-2/2
a=-1
(r+5).(r-3)
r^2-3r+5r-15
r^2+2r-15=0
delta=b^2-4ac
delta=2^2-4.1.(-15)
delta=4+60
delta=64
r=-b-/+ raiz de delta/2a
r=-2-8/2.1
r=-10/2
r=-5
r=-2+8/2.1
r=6/2
r=3
(x+3) (x+4)
x^2+4x+3x+12
x^2+7x+12=0
delta=b^2-4ac
delta=7^2-4.1.12
delta=49-48
delta=1
x=-b-/+ raiz de delta/2a
x=-7-1/2.1
x=-8/2
x=-4
x=-7+1/2.1
x=-6/2
x=-3
(y+2)^2
y^2+2.y.2+2^2
y^2+4y+4=0
delta=b^2-4ac
delta=4^2-4.1.4
delta=16-16
delta=0
y=-b-/+ raiz de delta/2a
y=-4-0/2.1
y=-4/2
y=-2
(x+6).(x-6)
x^2-6x+6x-36
x^2-36=0
x^2=0+36
x^2=36
x= raiz de 36
x=-/+ 6