Question

Classifique as equações a seguir como completa ou incompleta, se for do 2º grau.?
a) 2x² + 6 b) x= 0 c) 0x²+x=0 d) x² + 2x -7 = 0 e) - x²- x-0=0 f) x²=7x g) -3x²-0x+4=0
h) 5/4x²-x=0 i) -2,4x² + 0,2x - 8=0 j) 0x² -5x + 2=0

Answer 1

Para uma equação ser do 2° Grau ela deve ser escrita na forma:

$a x^{2} +bx+c=0\\\\ com, a \neq 0$



$a) 2 x^{2} +6=0\\\\ a=2;b=0;c=6\\\\ Incompleta\\\\\\\\ c) 0 x^{2} +x=0\\ \\ a=0;b=1;c=0\\\\ Primeiro .Grau\\\\\\\\ d) x^{2} + 2x -7 = 0\\\\ a=1;b=2=c-7\\\\ Completa$





$e) - x^{2} - x-0=0\\\\a=-1;b=-1;c=0\\\\ Incompleta\\\\\\\\ f) x^{2} =7x\to x^{2} -7x=0\\\\ a=1b=-7;c=0\\\\ Incompleta\\\\\\\\ g) -3 x^{2} -0x+4=0 \\\\ a=-3;b=0;c=4\\\\ Incompleta$





$h) \frac{5 x^{2} }{4} -x=0\\\\ a= \frac{5 }{4};b=-1;c=0\\\\ Incompleta\\\\\\\\ i) -2,4 x^{2} + 0,2x - 8=0\\\\ a=-2,4;b=0,2;c=-8\\\\ Completa\\\\\\\\ j) 0 x^{2} -5x + 2=0\\\\ a=0;b=-5;c=2\\\\ Primeiro.Grau$