Question

c) -3x2 + 4x + 4 = 0
d) 5x2 – 3x - 2 = 0​

Answer 1

fórmula de bháskara:

/\= b²-4•a•c

$x = \frac{ - b + - \sqrt{delta} }{2 \times \: a}$

c) /\= 4²-4•(-3)•4

/\= 16+48

/\= 64

$x = \frac{ - 4 + - \sqrt{64} }{2 \times ( - 3)}$

x¹= -4 + 8 / -6

x¹= 4/-6

x¹= 0,666...

x²= -4-8 / -6

x²= -12 / -6

x²= 2

d) /\= (-3)²-4•5•(-2)

/\= 9 + 40

/\= 49

$x = \frac{ - ( - 3) + - \sqrt{49} }{2 \times 5}$

x¹= 3+7 / 10

x¹= 10 / 10

x¹= 1

x²= 3-7 / 10

x²= -4 / 10

x²= -0,4