Question

Tìm x biết 

a/ (2x-3)² - (x+5)²=0

b/ x³ + x² - 4x=4

c/ (x-1)(2x+3) - x(x-1)=0

d/ x² - 4x + 8=2x-1

Answer 1

(2x-3)²-(x+5)²=0

<=>(2x-3-x-5)(2x-3+x+5)=0

<=>(x-8)(3x+2)=0

<=>x-8=0 hoặc 3x+2=0

<=>x=8 hoặc x=-2/3

 

Answer 2

(2x-3)2
-(x+5)2=0
<=>(2x-3-x-5)(2x-3+x+5)=0
<=>(x-8)(3x+2)=0
<=>x-8=0 hoặc 3x+2=0
<=>x=8 hoặc x=-2/3

chcú cậu hok tốt @_@

Answer 3

(2x-3)² - (x+5)² = 0
<=>(2x-3-x-5)(2x-3+x+5)=0
<=>(x-8)(3x+2)=0
<=>x-8=0 hoặc 3x+2=0
<=>x=8 hoặc x=-2/3