4x^2+5x-7,-3x^2+3x-4 and x^2-1
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Answer:
(2x^2+8x-12) is the correct answer.
Step-by-step explanation:
4x^2+5x-7+(-3x^2+3x-4)+(x^2-1)
=4x^2+5x-7-3x^2+3x-4+x^2-1
=4x^2-3x^2+x^2+5x+3x-7-4-1
=2x^2+8x-11-1
=2x^2+8x-12
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