Answer:
just add the x's then you will get it that how i got to do it
Explanation:
Answer: The answer is this c=6x^2-3x-11
c=P-a-b:
P=10x^2+4x-9
a=7x+3
b=4x^2-1
c=10x^2+4x-9-(7x+3)-(4x^2-1)
Refine
c=6x^2-3x-11 <---This is the answer
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