Question

responda as questões (são equações de 2° grau)
2
b)x +2x +1=100


2
c)4x - 36x + 81 =9


2
d)9x +30x +25=16

Answer 1

d)9x²+30x+25=16
9x²+30x+25-16
9x²+30x+9=0

•a=9 b=30 c=9•

∆=(30)²-4(9)(9)
∆=900-324=576
x=-30±√576 / 2.9
x=-30±24/18
x'=-30+24/18=-6/18=0,333....
x"=-30-24/18=-54/18=-3