5. If A = 3.x2 – 7x - 8 and B=x2-5x-4
find 2A + B.
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Answer:
7x² - 19x -20
Step-by-step explanation:
Given, A = 3x² - 7x -8
B = x² - 5x - 4
Therefore, 2A + B =2(3x² - 7x -8) + x² - 5x - 4
= 6x² - 14x - 16 + x² - 5x - 4 = 7x² - 19x -20
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