Question

Factorise the following =×2+9×+20

Answer 1

$\huge{\mathcal{\blue{\underline{Answer}}}}$

$= x {}^{2} + 9x + 20 \\ = x {}^{2} + 5x + 4x + 20 \\ = x(x + 5) + 4(x + 5)$

$\huge{\mathcal{\blue{\underline{(x+4)(x+5)}}}}$