The discriminant △ = 6 2-4 * 3 * 4 =- 120, so the original equation has two unequal real roots.
Scheme 1, matching method:
3(x+ 1)^2-3-4=0.
3(x+ 1)^2=7.
(x+ 1)^2=7/3.
x+ 1= (√2 1)/3。
x 1 =- 1+(√2 1)/3。
x2=- 1-(√2 1)+/3。
Scheme 2, formula method:
x 1,2={-6 √[(6^2-4*3*(-4)]}/(2*3).
=(-6 √84)/6.
=(-6 2√2 1)/6.
x 1 =- 1+(√2 1)/3;
x2=- 1-(√2 1)/3。