Factorise x2 plus x-37 equals -8x-1?

Answer 1

x^2+x-37=-8x-1

move -8x-1 to the left side

x^2+x-37+8x+1=0

x^2+9x-36=0

Now what two numbers add up to 9 and if you multiply them you get -36?

12 and -3

So you get x^2+9x-36=(x+12)(x-3)