Question

Responder

a) 4x = x +6
b) 5x +6 = 2x -3
c) x² + 2x - 1 = x² - x + 2
d)5x + 3y = 19
4x - 7y = -13

e) x² - 25 = 0
f) x² - 36 = 0
g) x² - 9 = 55
h) x² - 17 = 127
i) 4x² - 16 = 48
J) 3x² + 31 = 79
K) 7x² + 14 = 861
L) x² - 10/4 = 15/4
M) x²/3 + 5/6 = 11/12
N) 11 = 121 / x²

Answer 1

a) 3x= 6
x= 2
b)3x=-9
x= -3
c)2x + x =+2-1
3x = 1
x = 1/3
d)5x + 3y = 19
4x - 7y = -13
despejo x en ambas

x= (19-3y)/5
x= (-13+7y)/4

igualo
(19-3y)/5 = (-13+7y)/4
4*(19-3y) = 5*(-13+7y)
76-12y = -65+35y
76+65 = 35y+12y
141 = 47 y
y = 141/47
y = 3

x= (19-3*3)/5 =2

e) x = +-(raiz de 25)
x1 = 5      x2= -5
f) x1 = 6     x2= -6
g) x1 = +8     x2 = -8
h) x1 = +12     x2 = -12
i) x = raiz(64/4)
x1 = 4     x2 = -4
j) x= raiz(48/3)
x1 = 4    x2 = -4
k)x = raiz ((861-14)/7)  
x1 = 11    x2= -11
l)x = raiz ((25/4)  
x1 = 5/2    x2= -5/2
m)x = raiz((11/12-5/6)*3)
x1 = 1/2       x2= -1/2
n)x = raiz(121/11)
x1 = - 3.316     x2 = 3.316