Question

RAIZ REAL DE 2X2-7X-4=0

Answer 1

Olá.

• 2x² - 7x - 4 = 0

A = 2
B = -7
C = -4

Δ = b² - 4ac
Δ = 49 - 4.2(-4)
Δ = 49 + 32
Δ = 81

x = -b +- √Δ / 2a

x1 = 7 + 9 / 4 = 16 / 4 = 4
x2 = 7 - 9 / 4 = -2/4 = -1/2

S = {-1/2,4}

Bons estudos.