Question

qual o valor de?
2x²=-3+7x??

Answer 1

2x^2 = - 3 + 7x
2x^2 - 7x + 3 = 0
x = 7 +- 5/4
x' = 3
x" = 1/2

S = { 3 ; 1/2 }

Answer 2

2x^2=-3+7x
2x^2-7x+3=0
delta=b^2-4ac
delta=(-7)^2-4.2.3
delta=49-24
delta=25
x=-b-/+ raiz de delta/2a
x=-(-7)-5/2.2
x=7-5/4
x=2/4 (:2)
x=1/2
x=-(-7)+5/2.2
x=7+5/4
x=12/4
x=3