ac - ad + bc - bd = ?
(a + b) (c - d)
(a - b)(c - d)
(a + b) (c + d)
(a + c) (b - d)
(a - 10)(a + 4) = ?
a2 - 6a - 40
a2 + 6a + 40
a2 + 6a - 40
a2 - 6a + 40
12.5 × 12.5 - 2 × 12.5 × 0.5 + 0.5× 0.5 = ?
144
121
12
12.55
xu - xv - yu + yv = ?
(x - y)(u - v)
(x + y)(u - v)
(x - y)(u + v)
(x + y)(u + v)
51 × 49 = ?
2499
2500
5149
2501
2x2 + 8x - 24 = ?
(x + 6)(2x - 4)
(x - 6)(2x - 4)
(x - 6)(2x + 4)
(x + 6)(2x + 4)
ab - 3a + 5b - 15 =?
(b - 3)(a + 5)
(b + 3)(a + 5)
(b - 3)(a - 5)
(b - 3) (a - 5)
-5n2 + 25n - 20 = ?
(n + 1)(20 - 5n)
(n - 1)(20 - 5n)
(n - 1)(5n - 20)
(n + 1)(5n + 20)
x2 + 3x + 2 = ?
(x + 1)(x + 2)
(x - 1)(x + 5)
(x + 1)(x - 5)
672 - 332 = ?
67
33
34
3400
