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( x + 9) ( x -8)
x1= -9 , x2 = 8
2. 9q² - 30q + 25 = 0
( 3q - 5) ( 3q - 5)
q = 5/3
4. (3-x)² = 121
9 - 6x + x² = 121
x² -6x - 112 = 0
( x - 14) ( x + 8)
x = 14 x = -8
5.2y² + y - 6 = 0
(2y - 3) ( y +2)
y = 3/2 y =-2
6. 3x² + 10 - 13x = 0
3x² - 13x +10 =0
( 3x + 2) ( x -5)
x = -2/3 x= 5