1. a) (4x-3)(8x+6) = 32x²+24x-24x-18=32x²-18=18*(2x²-1);
b) 2y(y²-1)(2+y) = 2y(y-1)(y+1)(2+y) = 2y²-2y+2y²+2y+4y+2y²=6y²+4y = 2y(3y+2)
2. a) ax + 3ay + 5x + 15y = a(x+3y) + 5(x+3y) = (a+5)(x+3y)
b) —
c) ab - ac - a² + bc = c(b-a) + a(b-a) = (c + a)(b-a)
3. a) 4y³- (1+2y)(2y²-y) = 4y³-2y²+y-4y³+2y²=y
y=1/9
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Answers & Comments
1. a) (4x-3)(8x+6) = 32x²+24x-24x-18=32x²-18=18*(2x²-1);
b) 2y(y²-1)(2+y) = 2y(y-1)(y+1)(2+y) = 2y²-2y+2y²+2y+4y+2y²=6y²+4y = 2y(3y+2)
2. a) ax + 3ay + 5x + 15y = a(x+3y) + 5(x+3y) = (a+5)(x+3y)
b) —
c) ab - ac - a² + bc = c(b-a) + a(b-a) = (c + a)(b-a)
3. a) 4y³- (1+2y)(2y²-y) = 4y³-2y²+y-4y³+2y²=y
y=1/9