a: \(\Leftrightarrow x^2+3x-10-x^2-4x+38=0\)
=>28-x=0
hay x=28
b: \(\Leftrightarrow x^2+4x+4+x^2-2x+1=2\left(x^2+4x+3\right)\)
\(\Leftrightarrow2x^2+2x+5-2x^2-8x-6=0\)
=>-6x-1=0
=>x=-1/6
c: \(\Leftrightarrow4x^2-4x+1+5=4x^2-9-x\)
=>-4x+6+9+x=0
=>-3x=-15
hay x=5
d: \(\Leftrightarrow x^3-3x^2+3x-1+3x^2-x^3+5x=0\)
=>8x=1
hay x=1/8
a, <=> x^2 + 3x - 10 = x^2 + 4x - 38
<=> x = 28
b, <=> 2x^2 + 2x + 5 = 2( x^2 + 4x + 3 )
<=> 6x = -1 <=> x = -1/6
c, <=> 4x^2 - 4x + 6 = 4x^2 - 9 - x
<=> -3x + 15 = 0 <=> x = 5
d, <=> x^3 - 3x^2 + 3x - 1 + 3x^2 = x^3 - 5x
<=> 8x - 1 =0 <=> x = 1/8
