Question 203226
(xy^7)(x^4y)/(x^5y^2)
when multiplying add exponents; when dividing subtract them.
=(x^5y^11)/(x^5y^2)
=y^9
.
x-3/ x^2+7x+12
=(x-3)/(x+3)(x+4)
.
x^2-5x-1=0
x^2-5x  =1
x^2-5x+6.25=6.25+1 Complete the square.
(x-2.5)^2=7.25
x-2.5=+-sqrt(7.25) sqrt of each side
x=2.5+sqrt(7.25), x=2.5-sqrt(7.25)
.
Ed