Question

a) 135 - 5 × ( x + 4 ) = 35

b)  3² × ( x + 4 ) - 5² = 5 × 2²

 

Answer 1

a) 16 nha bn!!

b) 1 nha bn !!

k mik nha

Answer 2

a) 135 - 5 × ( x + 4 ) = 35

=>5x(X+4)=135-35

=>5x(x+4)=100

=>x+4=100:5

=>x+4=20

=>x=20-4

=>x=16

b)  3² × ( x + 4 ) - 5² = 5 × 2² 

=>9x(x+4)-25=5x4

=>9x(x+4)-25=20

=>9x(x+4)=20+25

=>9x(x+4)=45

=>x+4=45:9

=>x+4=5

=>x=5-4

=>1