Answer: 9x2 + 7x - 56
Step-by-step explanation: Because there is no factor expression.
Step-1 : Multiply the coefficient of the first term by the constant 9 • -56 = -504
Step-2 : Find two factors of -504 whose sum equals the coefficient of the middle term, which is 7 .
-504 + 1 = -503
-252 + 2 = -250
-168 + 3 = -165
-126 + 4 = -122
-84 + 6 = -78
-72 + 7 = -65
For tidiness, printing of 18 lines which failed to find two such factors, was suppressed
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored.