Question

factorise x square - 4 x minus 45​

Answer 1

Answer:

x²-4x-45

x²-9x+5x-45

x(x-9)+5(x-9)

(x+5)(x-9)

Answer 2

Answer:

${x}^{2} - 4x - 45 \\ \\ = {x}^{2} - 9x + 5x - 45 \\ \\ = x(x - 9) + 5(x - 9) \\ \\ = (x - 9)(x + 5)$