Question

×2-×-20=0 calcaular equaçao

Answer 1

delta = b²-4ac
delta = -1²-4*1*-20
delta = 1+80
delta = 81
x1=-b+raiz(delta)
x1=-(1)+9/2(1)
x1=8/2

x1=4

x2=-(1)-9/2
x2=-8/2

x2=-4

Answer 2

Deltra =b2-4ac Deltra =-1elevado a 2-4.1.-20 Deltra =1+80 Deltra =81 ×1=-b+raiz quadrada deltra  ×1=-(1)+9/2 (1) ×1=8/2 ×1=4 ×2=-1)-9/2 ×2=-8/2 ×=4