Question

9.4. factorise by
midterm splitting:
x²-x-72​

Answer 1

${x}^{2} - x - 72$

${x}^{2} - (9 - 8)x - 72$

${x}^{2} - 9x + 8x - 72$

$x(x - 9) + 8(x - 9)$

$(x - 9)(x + 8)$