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14-03-2021
Mathematics

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Find the errors and correct the following mathematical sentences.

Find the errors and correct the following mathematical sentences class=

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14-03-2021

Answer:

ix) (2a + 3)² = 4a² +12a + 9

x) a) x² + 7x + 12 = (-3)² + 7(-3) + 12 = 9 -21 + 12 = 0

b) x² - 5x + 6 = (-3)² - 5(-3) + 6 = 9 + 15 + 6 = 30

c) x² + 5x = (-3)² + 5(-3) = 9 -15 = -6

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