find the value of A+B-C. If a=3x²-4x + 1 , B =5x²+3x-8 and C = 4x²-7x+3
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4x² + 6x - 10
Step-by-step explanation
A + B - C
= (3x² - 4x + 1) + (5x² + 3x - 8) - (4x² - 7x + 3)
= 3x² - 4x + 1 + 5x² + 3x - 8 - 4x² + 7x - 3
= 3x² + 5x²- 4x² - 4x + 1 + 3x - 8 + 7x - 3
= 4x² - 4x + 1 + 3x - 8 + 7x - 3
= 4x² - 4x + 3x + 7x + 1 - 8 - 3
= 4x² - 4x + 10x + 1 - 8 - 3
= 4x² + 6x - 10
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