(i) x(12x + 7) – 10
(ii) (4 – x)2 – 2x
Answer :
(i) x(12x + 7) – 10
Above terms can be written as,
12x2 + 7x – 10
12x2 + 15x – 8x – 10
Take out common in all terms we get,
3x(4x + 5) – 2(4x + 5)
(4x + 5) (3x – 2)
(ii) (4 – x)2 – 2x
(4 – x)2 – 2x
We know that, (a – b)2 = a2 – 2ab + b2
So, (42 – (2 × 4 × x) + x2) – 2x
16 – 8x + x2 – 2x
x2 – 10x + 16
x2 – 8x – 2x + 16
Take out common in all terms we get,
x(x – 8) – 2(x – 8)
(x – 8) (x -2)
More Solutions:
- Factorise 2a2b2 – 7ab – 30
- Factorise (x – y)2 – 6(x – y) + 5
- Factorise 4(a – 1)2 – 4(a – 1) – 3
- Factorise 3 – 5a – 5b – 12(a + b)2
- Factorise (x + 4)2 – 5xy -20y – 6y2
- Factorise 4(2a – 3)2 – 3(2a – 3) (a – 1) – 7 (a – 1)2
- Factorise (2×2 + 5x) (2×2 + 5x – 19) + 84
- Factorise x2 – 8x + 7
- Factorise y2 + 7y – 18
- Factorise a2 – 3a – 54