Question

a) 2x2 – 5x - 12 = 0​

Answer 1

Resposta:

s= {4, 3/2}

Explicação passo-a-passo:

2x² -5x - 12=0

A= 2; B= -5; C= -12

∆= b²- 4 • a • c

∆= (-5)²- 4 • 2 • (-12)

∆= 25+ 96

∆= 121

x= -b ± √∆/2-a

x= -(-5) ±√ 121/ 2•2

x=5± 11/4

x'= 5+11/4=16/4=4

x''= 5-11/4=(6/4) : 2=3/2