Question
Factorise:
$z^2+19 z-150$
$z^2+19 z-150$
✓
Answer
$z^2+19 z-150$
$=z^2+25 z-6 z-150$
$\{-150=25 \times(-6), 19=25-6\}$
$=z(z+25)-6(z+25)$
$=(z+25)(z-6)$
$=z^2+25 z-6 z-150$
$\{-150=25 \times(-6), 19=25-6\}$
$=z(z+25)-6(z+25)$
$=(z+25)(z-6)$
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