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Sagot :

Answer:

1. x² + 4x + 3 = 0

a = 1, b = 4, c = 3

b²- 4ac = 4² - 4(1)(3)

= 16 - 12

= 4

(the root is unequal and real)

2. x² - 5x + 4 = 0

a = 1, b = -5, c = 4

b²- 4ac = -5² - 4(1)(4)

= 25 - 16

= 9

(the root is unequal and real)

3. x² + 7 = 0

a = 1, c = 7

b²- 4ac = 0 - 4(1)(7)

= - 28

(the root is imaginary)

4. 4x² - 4x + 1 = 0

a = 4, b = -4, c = 1

b²- 4ac = -4² - 4(4)(1)

= 16 - 16

= 0

(the root is equal and real)

5. 2x² + 6x + 3 = 0

a = 2, b = 6, c = 4

b²- 4ac = 6² - 4(2)(3)

= 36 - 24

= 12

(the root is unequal and real)