Question

Calcule o valor numérico da expressão b^2 – 4 • a • c para:
A) a ⁼ 1, b ⁼ 5 e c ⁼ – 6
B) a ⁼ – 1, b ⁼ – 5 e c ⁼ 6
C) a ⁼ 1, b ⁼ – 4 e c ⁼ 4
D) a ⁼ 2, b ⁼ – 4 e c ⁼ 4

Answer 1

A) 49 (25 -4x1x-6)
B) 49 (25-4x-1.6)
C) 0 (16-4x1x4)
D) -16 (16-4x2x4)

Answer 2

A)25-4•1•-6
25+24=49
B)25-4•-1•6
25+24=49
C)16-4•1•4
16-16=0
D)16-4•2•4
16-32=-16