Question

Resolva as equações em que U=R.
a) x^2-64=0
b)2=x^2
c)x^2-7=0
d)3x^2+7=0
e)9x^2-16=0
f)(x-5)^2=2x.(x-5)

CÁLCULOS, POR FAVOR

Answer 1

a-

${x}^{2} = 64$

$x = \sqrt{64}$

$x = \frac{ + }{}8$

b-

$\sqrt{2} = x$

$x = \frac{ + }{} 1.4142$

c-

${x}^{2} = 7$

$x = \sqrt{7}$

$x = \frac{ + }{} 2.6457$

d-

$3{x}^{2} = - 7$

$3x = \sqrt{ - 7}$

$x = \frac{ + }{} 0.8819$

e-

$9{x}^{2} = 16$

$9x = \sqrt{16}$

$9x = \frac{ + }{} 4$

$x = \frac{ + }{} 0.4444444$

f-

${x}^{2} - 2x - 10 + 10= - 25$

$- {x}^{2} = - 25.( -1)$

${x }^{2} = 25$

$x = \sqrt{25}$

$x = \frac{ + }{} 5$