1) x²=-5x a) x=0 b) x=-5 c) x=5 d) x=1 2) x²-8x+12=0 a) x=6 / x=2 b) x=-6 / x=-2 c) x=6 / x=-2 d) x=-6 / x=2 3) 3x+21 a) x=-7 b) x=7 c) x=-9 d) x=9 4)  4(n+2) a) 4n-8 b) 16n-8 c) 4n+8 d) -10n+4 5) x²+2x-24 a) x=12 b) x=5 c) x=4 d) x=22 6) 3x+11x+6 a) (x+3) (3x+2) b) (x+9) (x+2) c) (x-3) (3x-2) d) (x-9) (x-2) 7) 4+ (6+x) a) 2+x b) 2-x c) 10-x d) 10+x 8) x²-10x+16 a) (x+2) (x+8) b) (x-2) (x-8) c) (x-3) (x-5) d) (x+3) (x+5) 9) x²+16x+28 a) x=-14 / x=-2 b) x=14 / x=2 c) x=3 / x=4 d) x=-3 / x=-4 10) (x+4)² =49 a) x=7 /x=2 b) x=-3 / x=11 c) x=3 /x=-11 d) x=-7 x=-2

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