Question

Докажите тождество x^2 - 12x + 45 = (x - 15)(x + 3)

Answer 1

x^2-12x+45=(x-15)(x+3)

x^2-12x+45-(x^2-12x-45)=0

x^2-12x+45-x^2+12x+45=0

-12x+45+12x+45=0

45+45=0

90$neq$0