Question

desenvolva as funções

a) y=x²
b) y=x²+1
c) y=x²-1
d) y=-x²
e) y=-x²+1
f) y=-x²-1
g) y=x²+x​

Answer 1

a.

y = x² *** y = 0

0 = x²

x² = 0

x = 0

b.

y = x² + 1 *** y = 0

0 = x² + 1

- x² = 1 . (- 1)

x² = - 1

x ± √(- 1)

x∉ℝ

c.

y = x² - 1 *** y = 0

0 = x² - 1

- x² = - 1 . (- 1)

x² = 1

x = ± √1

x = ± 1

d.

y = - x² *** y = 0

0 = - x²

- x² = 0 . (- 1)

x² = 0

x = 0

e.

y = - x² + 1 *** y = 0

0 = - x² + 1

x² = 1

x = ± √1

x = ± 1

f.

y = - x² - 1 *** y = 0

0 = - x² - 1

x² = - 1

x ± √(- 1)

x∉ℝ

g.

y = x² + x *** y = 0

0 = x² + x

x² + x = 0

x . (x + 1) = 0

x = 0

x + 1 = 0

x = - 1

atte. yrz