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Sagot :

devishri1977

Answer:

Step-by-step explanation:

1)x² - 16x = - 64

x² - 16x + 64= 0

a = 1 ; b = -16 ; c = 64

D = b² - 4ac = (-16)² - 4*1*64 = 256 - 256 =

D = 0

2) 9x² = 9x + 2

9x² - 9x - 2 = 0

D = (-9)² - 4*9*(-2) = 81 + 72

D = 153

3)x² - 3 = x

x² -x - 3 =0

D = (-1)² - 4*1*(-3) = 1 + 12 = 13

D = 13

4) 3x² + 4x + 2=0

D = 4² - 4*3*2 = 16 - 24 = -8

D = -8

5)x² - 4 = 0

D = 0 - 4*1*(-4) = 0 + 16 = 16

D = 16

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