Разложи на множители многочлен x2 – 6xy – 49 + 9y2.
x2 – 6xy – 49 + 9y2 = (x2 –
+ 9y2) – 49 = (
–
)2 – 49 = (x – 3y +
)(
–
– 7).
x2 – 6xy – 49 + 9y2 = (x2 –
+ 9y2) – 49 = (
–
)2 – 49 = (x – 3y +
)(
–
– 7).
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