Question

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Answer 1

a) x + 3x² - 2x² + x = -6

2x + x² = -6

2x + x² + 6 = 0

a = 1

b = 2

c = 6

b) x(x + 2) = 5/7 - x

x² + 2x = 5/7 - x

x² + 2x + x = 5/7

x² + 3x - 5/7 = 0

a = 1

b = 3

c = -5/7

c) (x - 1)² = 1

x² - 2x.1 + 1²

x² - 2x + 1

a = 1

b = -2

c = 1

d) 1/x = 3x + 4

1 = (3x + 4).x

1 - (3x + 4).x = 0

1 - (3x² + 4x) = 0

1 - 3x² - 4x = 0

(-3x² - 4x + 1 = 0).(-1)

3x² + 4x - 1 = 0

a = 3

b = 4

c = -1