Question

(x+10 ) * (x+10 ) = 400

Answer 1

=> (x+10)²=400

=> (x+10)²=20²=(-20)²

+) x+10=20

=> x=20-10

=> x=10

+) x+10=-20

=> x=-20-10

=> x=-30

Vạy \(x\in\left\{-30;10\right\}\). H

Answer 2

( x + 10 ) * (x+ 10) = 400

x*(10+10)=400

x*20=400

x=400 : 20

x = 20

Answer 3

(x+10)*(x+10)=400

(x+10)^2=400

(x+10)=20

x=20-10=10

tick nha hiền

Answer 4

(x+10).(x+10)=400

(x+10)^2=400

(x+10)^2=20^2 

x+10=20 và x+10=-20

x=10         và x=-30

 

Answer 5

10 nha bn