Factorise : 25 - (4x2 + 12x + 9). My answer is coming (8 + 2x)(2 - 2x), but in my book, its written

4(x + 4)(1-x). Plz help!

25 – (4x2 + 12x + 9)

= 25 – 4x2 – 12x – 9)

= 16 – 4x2 – 12x

 = 4 (4 – x2 – 3x)

 = 4 ( – x2 – 3x + 4)

 = 4 ( – x2 – 4x + x + 4)

 = 4 { – x (x + 4)  + 1 (x + 4) }

 = 4 (x + 4)  (1 – x)

  • -1

25 - [(2x)22 x 2x x 3 + 32]

25-[2x + 3 ][2x+3]

52-[2x +3]2

[5 - 2x -3][5+2x+3]

book galat hai

  • 2
What are you looking for?