Respuesta :
Answer:
because you have to factor -1 out of -3x^2-7x+9
Step-by-step explanation:
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Answer: He can't combine like terms, because when you combine like terms he has to multiply and add at the same time which isn't quite possible. Look at step-by-step for explanation.
Step-by-step explanation:
-3x(2) -7x=9
-3x-7x = -10x
(2)+9 = ? You can't add and multiply.