(5^2+3^2).x+(5^2-3^2).x-40=10^2
34x+16x-40=100
50x-40=100
50x=140
x=14/5
(52+32)X+(52-32)=102+40=100+40=140
X[(52+32)+(52-32)]=140
(phá ngoặc)
X[52+32+52-32]=140
X[25+25]=140
X=140/50=5.6
tik nhá đa tạ
( 52 + 32 ) * X + ( 52 - 32 ) * X - 40 = 102
-> ( 25 + 9 ) * X + ( 25 - 9 ) * X - 40 = 100
-> 34 * X + 16 * X = 100 + 40
-> ( 34 + 16 ) * X = 140
-> 50 * X = 140
-> X = 140 / 50
-> X = 2,8
\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)