Question

x²-49-0
-X2-7X=0
=>2x² -50=0
=>X²-5x = 0
->x² - 5x+6=0​

Answer 1

• x² - 49 = 0

x² = 49

Vx² = V49

x = 7

• - x² - 7x = 0

• 2x² - 50 = 0

2x² = 50

x² = 50 / 2

x² = 25

Vx² = V25

x = 5

• x² - 5x = 0

• x² - 5x + 6 = 0

delta = (-5)² - 4.1.6 = 25 - 24 = 1

x = ( - (-5) +- V1 ) / 2.1 = ( 5 +- 1 ) 2

x' = 2 , x" = 3