Question

(m + 9) ² = m² +81
(x-4)² = x2 - 12x + 3 6
(5x-1) (3 x+5) = 15 x² – 28 x-5
7d (d4-9d² + 12) = 725-63d4+84​

Answer 1

Answer:

The given expression 15x

2

−x−28 can be factorised as follows:

15x

2

−x−28=15x

2

−21x+20x−28=3x(5x−7)+4(5x−7)=(3x+4)(5x−7)

Hence, 15x

2

−x−28=(3x+4)(5x−7)