✔ 最佳答案
1.Simplify
2(x^2)-5x-12 9
------------------- x (2 + ---------)
4(x^2)-1 x-4
2(x^2)-5x-12 2(x-4) 9
------------------- x (---------- + ---------)
4(x^2)-1 x-4 x-4
(2x +3)(x-4) 2(x-4) + 9
------------------- x (-------------------)
(2x^2)-1 x-4
(2x +3)(x-4) (2x + 1)
------------------- x (-------------)
(2x+1)(2x -1) ( x-4)
(2x +3)
-------------
(2x -1)
2. a) Factorize (m+2)(m-8)+24
b) Using the result of (a), factorize (x^2+x+2)(x^2+x-8)+24.
a) m^2 – 6m -16 +24
m^2 – 6m + 8
(m -4)(m – 2)
b) Let m = x^2+x
(x^2+x+2)(x^2+x-8)+24 = (x^2+x -4) (x^2+x -2)
3. a) Factorize a^4+2a^2b^2+b^4
b) Using the result of (a), factorize a^4+a^2b^2+b^4.
a) (a^2 + b^2) (a^2 + b^2)
( a +b)(a-b) (a^2 + b^2)
b) Typo error: cannot be factorized
4. Factorize 2(y^3) + (1/4).
2[(y^3) + (1/8)]
2[(y^3) + (1/2)^3]
2(y + ½)[y^2 –(1/2)(y) + (1/2)^2)]
2(y + ½) (y^2 –y/2 + ¼)