(3) Move the term to 3x square+6x = 5,3 (x square +2x)=5, x square +2x=5/3, x square +2x+ 1=8/3, that is, the square of (x+ 1) =8/3, so x6.
By the way ... the people down there are a little lazy, so why don't you just say so? You just write because a= b= c=？ , so (Greek letter) = the square of b -4ac=? (original number replacement); The original equation has two unequal real roots (if the value obtained is greater than zero) and the original equation has two equal real roots (if the value obtained is equal to zero), so the original equation has no real roots.
(Revealing the answer: the first question has two unequal real roots, the second question has two equal real roots, the third question has no real roots, and the fourth question has two unequal real roots) (The fourth question should be simplified first)