Question

2×*2-7×-4=0? Me ajudem

Answer 1

2x^-7x-4=0
4x^2-7x-3=0

a=4
b=-7
c=-3

delta=b^2-4.a.c
delta=(-7)^2-4.4.(-3)
delta=+49-16.(-3)
delta=+49-48
delta=+1

x=-b+-raiz do delta÷2.a
x=-(-7)+-raiz de 1÷2.4
x=+7+1/8

x1=7+1/8
x1=8/8
x1=1

x2=7-1/8
x2=6/8
x2=3/4

Solução final: {x1=1;x=3/4}