Question

C) Factorise by splitting middle term (Any one )
i) x²-x-20
ii) 2x² +13x-21
step by step​

Answer 1

Answer:

${x}^{2} - x - 20 \\ {x}^{2} - 5x + 4x - 20 \\ x(x - 5) + 4(x - 5) \\ (x - 5)(x + 4) \\ \\ 2 {x}^{2} + 13x + 21 \\2 {x}^{2} + 6x + 7x + 21 \\ 2x(x + 3) + 7(x + 3) \\ (x + 3)(2x + 7)$