Question

please tell me the answer ​

Answer 1

$= > {x}^{2} - 21x \: + 90 \\ = > {x}^{2} - (15 + 6)x + 90 \\ = > {x}^{2} - 15x - 6x + 90 \\ = > x(x - 15) - 6(x - 15 \\ = > (x - 15)(x - 6)$

Answer 2

Answer:

${x}^{2} - 21x + 90$

Product=90

Sum= -21

Numbers= -15,-6

${x}^{2} - 15x - 6x - 90$

$({x}^{2} - 15x) - (6x - 90)$

$x(x - 15) - 6(x - 15)$

$(x - 6)(x - 15)$

Factorised

If you are finding the roots of the given quadratic equation

Then x= 6,15