21/08/2025
21/08/2025
21/08/2025
$16) x^2 - 2x + 2y - xy$
$= (x^2 - xy) + (-2x + 2y)$
$= x(x - y) - 2(x - y)$
$= (x - y)(x - 2)$
$17) x^2 + xy - 2x - 2y$
$= (x^2 - 2x) + (xy - 2y)$
$= x(x - 2) + y(x - 2)$
$= (x - 2)(x + y)$
$18) x^2 - xy - 6x + 6y$
$= (x^2 - 6x) + (-xy + 6y)$
$= x(x - 6) - y(x - 6)$
$= (x - 6)(x - y)$
$19) 2xy + 3z + 6y + xz$
$= (2xy + 6y) + (xz + 3z)$
$= 2y(x + 3) + z(x + 3)$
$= (x + 3)(2y + z)$
$20) 3x^2 - 3xy - 5x + 5y$
$= (3x^2 - 3xy) + (-5x + 5y)$
$= 3x(x - y) - 5(x - y)$
$= (x - y)(3x - 5)$
$21) x^2 - 6x - 2xy + 12y$
$= (x^2 - 2xy) + (-6x + 12y)$
$= x(x - 2y) - 6(x - 2y)$
$= (x - 2y)(x - 6)$
$22) x^2 + 3xy - 5x - 15y$
$= (x^2 + 3xy) + (-5x - 15y)$
$= x(x + 3y) - 5(x + 3y)$
$= (x + 3y)(x - 5)$
$23) 3x^2 - 2x - 3xy + 2y$
$= (3x^2 - 3xy) + (-2x + 2y)$
$= 3x(x - y) - 2(x - y)$
$= (x - y)(3x - 2)$
$24) 3x^2 - 3xy - 5x + 5y$
$= (3x^2 - 3xy) + (-5x + 5y)$
$= 3x(x - y) - 5(x - y)$
$= (x - y)(3x - 5)$
$25) x^3 + 6x^2 + x + 6$
$= (x^3 + 6x^2) + (x + 6)$
$= x^2(x + 6) + 1(x + 6)$
$= (x + 6)(x^2 + 1)$
$26) 9x^3 - 9x^2y - 4x + 4y$
$= (9x^3 - 9x^2y) + (-4x + 4y)$
$= 9x^2(x - y) - 4(x - y)$
$= (x - y)(9x^2 - 4)$
$27) 2x^2 - 6xy + 5x - 15y$
$= (2x^2 - 6xy) + (5x - 15y)$
$= 2x(x - 3y) + 5(x - 3y)$
$= (x - 3y)(2x + 5)$
$28) x^2y - x^3 - 9y + 9x$
$= (x^2y - x^3) + (-9y + 9x)$
$= x^2(y - x) + -9(y - x)$
$= (y - x)(x^2 - 9)$
$= (y - x)(x - 3)(x + 3)$
$29) x^3 + 2x^2 - 4x - 8$
$= (x^3 + 2x^2) + (-4x - 8)$
$= x^2(x + 2) - 4(x + 2)$
$= (x + 2)(x^2 - 4)$
$= (x + 2)(x - 2)(x + 2)$
$= (x + 2)^2(x - 2)$
$30) 5xy^2 - 5x + y^2 - 1$
$= (5xy^2 - 5x) + (y^2 - 1)$
$= 5x(y^2 - 1) + (y^2 - 1)$
$= (y^2 - 1)(5x + 1)$
$= (y - 1)(y + 1)(5x + 1)$
$31) 4x^3 - 4x^2 - 9x + 9$
$= (4x^3 - 4x^2) + (-9x + 9)$
$= 4x^2(x - 1) - 9(x - 1)$
$= (x - 1)(4x^2 - 9)$
$= (x - 1)(2x - 3)(2x + 3)$
$32) 10ax - 5ay - 2x + y$
$= (10ax - 5ay) + (-2x + y)$
$= 5a(2x - y) - (2x - y)$
$= (2x - y)(5a - 1)$
$33) a^3 - a^2x - ay + xy$
$= (a^3 - a^2x) + (-ay + xy)$
$= a^2(a - x) - y(a - x)$
$= (a - x)(a^2 - y)$
$34) x^2 + ab + ax + bx$
$= (x^2 + ax) + (bx + ab)$
$= x(x + a) + b(x + a)$
$= (x + a)(x + b)$
$35) ax - bx + ab - x^2$
$= (ax - x^2) + (ab - bx)$
$= x(a - x) + b(a - x)$
$= (a - x)(x + b)$
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