Question

in this tell me how how you do this point that is Circled​

Answer 1

Step-by-step explanation:

$x^{2} + 7x - 120 = 0$

here

  +7 is built by addition or subtraction of two values.

  -120 is built by multiplying the above two values.

   So,

       +7 is built here by +15+(-8)

       -120 is built here by 15 × (-8)

factorization can be done by

$x^{2} +15x-8x-120 = 0$

$x(x+15) -8(x+15)=0$

$(x-8)(x+15)=0$

I think it is by mistake they have included   (x-8)(x+15)=120.

It should be   (x-8)(x+15)=0