Page 131 - aljaber

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(x + 2)2 = x 2 + (x − 7)2 ()

x 2 + 4x + 4 = x 2 + x 2 − 14x + 49

x 2 − 18x + 45 = 0

(x − 3)(x − 15) = 0

.x = 15 x = 3

x = 15 . x − 7 = −4 x =3

. x + 2 = 17

:( )

x =1+1
y

xy = y + 1

y =1+ 1 y +1=1+x ()
x ()
:( )
xy = 1 + x . 2x + 3

.y = x

.x

x + 2x + 3 = 66
3x = 63
x = 21

.2x + 3 = 2(21) + 3 = 45

.x = 3 7 :( )
.
x −3

.x = 3