Question

ME AJUDEM P HOJE

(X+1).(X+2)=42

(X-3).(X+2)-14

(X-1)²+3 X=X+26

Answer 1

moça vc é de q série?

Answer 2

(x+1).(x+2)=42
x^2+2x+x+2=42
x^2+3x+2-42
x^2+3x-40=0
delta=b^2-4ac
delta=3^2-4.1.(-40)
delta=9+160
delta=169
x=-b-/+ raiz de delta/2a
x=-3-13/2.1
x=-16/2
x=-8
x=-3+13/2.1
x=10/2
x=5
(x-3).(x+2)-14
x^2+2x-3x-6-14
x^2-x-20=0
delta=b^2-4ac
delta=(-1)^2-4.1.(-20)
delta=1+80
delta=81
x=-b-/+ raiz de delta/2a
x=-(-1)-9/2.1
x=1-9/2
x=-8/2
x=-4
x=-(-1)+9/2.1
x=1+9/2
x=10/2
x=5
(x-1)^2+3x=x+26
x^2-2.x.1+1^2+3x=x+26
x^2-2x+1+3x=x+26
x^2-2x-x+3x+1-26
x^2-3x+3x-25
x^2-25=0
x^2=0+25
x^2=25
x= raiz de 25
x=-/+ 5