Question

1. Resolva as equações do 2.° grau, sendo
U= R:
a) x2 - 9 = 0
$b) {4x}^{2} - 25 = 0$
$c) {9x}^{2} = 49$
$d) {x }^{2} - 2 = 0$
$e){8x}^{2} - 320 = 0$
$f) { - x}^{2} + 2x = 0$
gente pfvr me ajudaaa!!
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Answer 1

Resposta:

a) x^2-9=0

x^2=9

x=

$\sqrt{9}$

x=+_3

Explicação passo-a-passo:

b)4x^2-25=0

4x^2=25

x^2=25/4

x^2=6,5

$\sqrt{6.5}$

x=2,54

c)9x^2=49

x^2=49/9

x^2= 5,444...

x=

$\sqrt{5.444}$

x=5,333

d)x^2-2=0

x^2=2

x=

$\sqrt{2}$

x=+_1,41

e)8x^2-320=0

8x^2=320

x^2=320/8

x^2=40

x=

$\sqrt{40}$

x=+_6,32

f)x^2+2x=0

^= b2-4ac

^=2^2-4*1*0

^=4-0

^=4

x=

$- b + - \sqrt{ > \div 2 \times a}$

x=-2+_2/2

x= _2+2/2=0/2=0

x"= _2-2/2》=-4/2》= -2