ex.1.
a)12(5-4)= 12 ×1= 12
b)2012(950-949) =2012 × 1 = 2012
c)28(92+8)= 28×100= 2800
d)59(950-949)= 59 × 1= 59
e)182(182-181)= 182×1= 182
f) 48(48-47-1)= 48 × 0 =48
ex.2.
a)2(x+y)
b)2(a-b+c)
c)2(xy+ab-1)
d)2(a+2)
[tex]e)2( - {x}^{2} + 2xy + 3 {y}^{2} )[/tex]
f)2(2x+5y-7z)
ex.3.
a)x(3+4y)
b)x(a-b+z)
c)x(x+2)
[tex]d)x(y - {x}^{2} + 2)[/tex]
[tex]e)x( {x}^{2} + 5x - 2)[/tex]
[tex]f)x( {x}^{3} - {x}^{2} + 3x + 6)[/tex]
ex.4.
a)(x+1)(3+a)
b)(x+1)(-4a+2b)
c)(x+1)(x+3)
d)(x+1)[(x-2)+(2x+3)]
e)(x+1)[(a-2) +4a]
f)(x+1)[(6x-7)-(x+1)]
ex.5.
a)7(x-a)
b)12(x+y)
c)24(a-b+c)
d)8a(1+a)
[tex]e)15( {x}^{2} + 1)[/tex]
[tex]f)11 {x}^{2} - 1)[/tex]
g)a(x+y-z)
[tex]h) {x}^{3} ( {x}^{2} + 1)[/tex]
[tex]i) \sqrt{3} (a - b)[/tex]
j)4x(y+2+3x)
[tex]k) \sqrt{5}x (2 - 3a)[/tex]
[tex]l)9a(1 + 3 {a}^{2} )[/tex]
