+118659 5x^2 - 25x
\(5x^2 - 25x\\ =5*x*x - 5*5*x\\ \mbox{you can take 5 and x out of both these terms}\\ =5x(x-5)\)
\(x^2-7x+6\)
Look for two numbers that multiply to give +6 and add to give -7
Sionce they multiply to give a positive number they must BOTH be negative or BOTH be positive.
Since that add to a negative they both must be negative numbers.
ok they multply to +6
-6 and -1 add to -7
-3 and -2 add to -5
ok so the numbers i am looking for are -6 and -1
\(x^2-7x+6=(x-6)(x-1)\)
