Question

tím x a) 12 . ( x - 4 ) + 3 . ( 2x + 5 ) = 16  

b) -10 . ( 2x + 4 ) - 2 . ( 6 - 15x ) = 48

ai giup mik vs mik k cho

Answer 1

a) => (12x-4)+(6x+15)=16

=>12x-48+6x+15=16

=>(12x+6x)-(15-48)=16

=>18x-(-33)=16

=>18x=16+(-33)

=>18x=-17

=>x=-17/18

KL

b) =>(-20x+(-40))-(12-30x)=48

=>-20x+(-40)-12+30x=48

=>(-20x+30x)+(-40-12)=48

=>10x+(-52)=48

=>10x=48-(-52)

=>10x=4

=>x=4/10

KL

Answer 2

a) 12( x - 4 ) + 3( 2x + 5 ) = 16

<=> 12x - 48 + 6x + 15 = 16

<=> 18x - 33 = 16

<=> 18x = 49

<=> x = 49/18

b) -10( 2x + 4 ) - 2( 6 - 15x ) = 48

<=> -20x - 40 - 12 + 30x = 48

<=> 10x - 52 = 48

<=> 10x = 100

<=> x = 10