Question

Упростите выражения :
1 ) (x+2) (x+11) -2x (3-4x)
2) (a+5) (a-2) + (a-4) (a+6)
3) (y-9) (3y-1) - (2y+1) (5y-7)
4) (4x-1) (4x-3) - (2x-10) (8x+1)

Answer 1

1) $x^{2} + 11x +2x + 22 - 6x +8x^{2} = 9x^{2} +7x +22$

2) $a^{2} -2a +5a-10 + a^{2} +6a-4a-24= 2a^{2} +5a-34$

3) $3y^{2} -y-27y+9-10y^{2} +14y+5y-7 = -7y^{2} -19y+16$

4) $16x^{2} -12x-4x+6-16x^{2} -2x-80x-10=62x+13$