Question

Câu 10. Tìm x:

a) 3 ( x - 5 ) + ( 2x + 1 ) . 3/2 = 5/3.

b) ( x + 2 ) mũ 2 - ( x - 2 )( x + 2 ) = 0.

Answer 1

a: \(3\left(x-5\right)+\frac32\left(2x+1\right)=\frac53\)

=>\(3x-15+3x+\frac32=\frac53\)

=>\(6x=\frac53-\frac32+15=\frac{10}{6}-\frac96+15=15+\frac16=\frac{91}{6}\)

=>\(x=\frac{91}{6}:6=\frac{91}{36}\)

b: \(\left(x+2\right)^2-\left(x-2\right)\left(x+2\right)=0\)

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

=>4(x+2)=0

=>x+2=0

=>x=-2