a) x²=81
b) x²=25
c) x²=7
d) 5x²=20
e) 4x²=1
f) x²-9=0
g) 2x²-6=0
h) x²-5x=0
i) 3x²-24x=0
j) - 2x²+x=0
k) 4x²-30x+56=0
l) x²+13x+36=0
m) 2x²-6x+4=0
n) -4x²-8x+32=0
b) x²=25
c) x²=7
d) 5x²=20
e) 4x²=1
f) x²-9=0
g) 2x²-6=0
h) x²-5x=0
i) 3x²-24x=0
j) - 2x²+x=0
k) 4x²-30x+56=0
l) x²+13x+36=0
m) 2x²-6x+4=0
n) -4x²-8x+32=0
Respuesta:
Es la D porque Dios quiso
Verified answer
Inciso A:
x² = 81
x = ± 81
x = 9 x = -9
Inciso B:
x² = 25
x = ± 25
x = 5
x = -5
Inciso C:
x² = 7
x = ± √7
x = √7
x = - √7
Inciso D:
5x² = 20
x² = 4
x² - 4 = 0
(x - 2) × (x + 2) = 0
x = -2
x = 2
Inciso E:
4x² = 1
4x² - 1 = 0
(2x - 1) × (2x + 1) = 0
2x - 1 = 0
2x +1 = 0
x = ½
x = - ½
Inciso G:
2x² - 6 = 0
x² - 3 = 0
x² = 3
x = ± √3
x = - √3
x = √3
Inciso H:
x² - 5x = 0
x × (x - 5) = 0
x = 0
x - 5 = 0
x = 0
x = 5
Inciso I:
3x² - 24x = 0
3x × (x - 8) = 0
x × (x - 8) = 0
x = 0
x - 8 = 0
x = 0
x = 8
Inciso K:
4x² - 30x + 56 = 0
2x² - 15x + 28 = 0
2x² - 7x - 8x + 28 = 0
x × (2x - 7) - 4(2x - 7) = 0
(2x - 7) × (x - 4) = 0
2x - 7 = 0
x - 4 = 0
x = 7/2
x = 4
Inciso L:
x² + 13x + 36 = 0
x² + 9x + 4x + 36 = 0
x × (x + 9) + 4(x + 9) = 0
(x + 9) × (x + 4) = 0
x + 9 = 0
x + 4 = 0
x = -9
x = -4
Inciso M:
2x² - 6x + 4 = 0
x² - 3x + 2 = 0
x² - x - 2x + 2 = 0
x × (x - 1) - 2(x - 1) = 0
(x - 1) × (x - 2) = 0
x - 1 = 0
x - 2 = 0
x = 1
x = 2
Inciso N:
-4x² - 8x + 32 = 0
x² + 2x + 8 = 0
x² + 4x - 2x + 8 = 0
x × (x + 4) - 2(x + 4) = 0
(x + 4) × (x - 2) = 0
x + 4 = 0
x - 2 = 0
x = -4
x = 2