Question

X square minus three x minus ten equal ziro solution by complet square method

Answer 1

$= {x}^{2} - 3x - 10 \\ = {x}^{2} - 2x + 5x - 10 \\ = x(x - 2) + 5(x - 2) \\ = (x - 2)(x + 5)$

So zeroes are 2,-5.