what is the identity for (x-a)(x-b)

= (x - a)(x - b)
= x(x - b) - a(x - b)
= x2 - xb - ax + ab
​= x2 - x(a + b) + ab
So, (x - a)(x - b) = x2 - x(a + b) + ab​
 

  • 100
x2+(a+b)x+(ab)
  • -18
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