Question

me pueden ayudar les dare coronita
a) x ^ 2 + 10x + 21 = 0
b) X ^ 2 + 10X + 16 = 0
c) x ^ 2 - 2x - 3 = 0
d) x ^ 2 - 6x - 16 = 0
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Answer 1

Respuesta:

a)  x = -3 , -7

b) x = -2 , -8

c) x =  3 , -1

d) x =  8 , - 2

Answer 2

Respuesta:

a. x² + 10x + 21 = 0

x² + 7x + 3x + 21 =0

x (x+7) + 3 (x+7)=0

(x+7) × (x+3) = 0

x+7=0

x+3=0

x1=-7 x2=-3

b. x² + 10x + 16 = 0

x² + 8x + 2x + 16 = 0

x (x+8) + 2 (x+8) = 0

(x+8) × (x+2) = 0

x+8= 0

x+2=0

x1= -8 x2= -2

c. x² - 2x - 3 = 0

x² + 3x - x - 3 =0

x (x+3) - (x-3) = 0

x+3 = 0

x-1= 0

x1 = -3 x2= 1

d. x² - 6x - 16 = 0

x² + 8x - 2x - 16 = 0

x (x+8) × (x-2) = 0

(x+8) × (x-2) = 0

x + 8 = 0

x - 2 = 0

x1 = -8 x2 = 2