Page 125 - aljaber

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:( ) ( )

4x − 12 = 3 + 2x

4x − 2x = 3 + 12

2x = 15

. x = 15 :( ) ()
2
x

16 − x .

105 .

5x + 10(16 − x) = 105

160 − 5x = 105

−5x = −55

. x = 11

:( ) ( )

5 − 4x 2 = 3(2x + 1) + 2
5 − 4x 2 = 6x + 3 + 2
−4x 2 − 6x = 0
−2x(2x + 3) = 0

2x + 3 = 0 −2x = 0

.x2 = −3 x1 = 0
2

:( ) ()

x+2 =3
x