Question

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Answer 1

Respuesta:

a) x² + 2x -15=0

x²+5x-3x-15=0

x(x+5)-3(x+5)=0

(x+5) (x-3)=0

x+5=0

x-3=0

x= -5

x=3

b) x²+4=4x

x²-4x+4=0

(x-2)²=0

x-2=0

x= 2

c) x²-5x-6=0

x²+x-6x-6=0

x(x+1)-6(x+1)=0

(x+1)(x-6)=0

x+1=0

x-6=0

x= -1

x= 6

d) 2+ x² -3x =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

e)

x²=6x+20+2x

x²=8x+20

x²-8x-20=0

x²+2x-10x-20=0

x(x+2)-10(x+2)=0

(x+2) (x-10)=0

x+2=0

x-10=0

x= -2

x= 10

f)8x= 9-x²+2x

8x+9+x²-2x=0

6x+9+x²=0

x²+6x+9=0

(x+3)²=0

x+3=0

x= -3

g) 2x²+20= -10x

x²+10= -5x

x²+10+5x=0

x²+5x+10=0

x= -5+√52-4×1×10

_______________

2×1

x= -5+√25-40

_____________

2

x= -5 +√-15

___________

2

x e/ R

h) x²-4x= -2x+5

x²-4x+2x-5=0

x²-2x-5=0

x= -(-2)+√(-2)²-4×1(-5)

__________________

2×1

x= 2+√4+20

___________

2

×= 2+√24

__________

2

x= 2+2√6

_________

2

x= 2+2√6

_________

2

×= 1+√6