Question

x²-4x-21+0 formula de baskara alguem me helppppp

Answer 1

x²-4x-21 +0

X²-4x -21 = 0

A = 1

B = -4

C = -21

∆ = b²-4.a.c

∆ = (-4)² -4.1.(-21)

∆ = 16 +84

∆ = 100

X= -b±√∆ / 2.a

X = -(4) ±√100 / 2

X1 = 4+10/2


X1= 7


X2= =4-10/2

X2= -3