Question

Solve the quardoatic equtiony²+ y = 2
using formula mothod
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Answer 1

Answer:

y = - 2, 1

Step-by-step explanation:

y² + y = 2

y² + y - 2 = 0

Here,

a = 1

b = 1

c = - 2

D = b² - 4ac

   = 1² - 4 ( 1 ) ( - 2 )

   = 1 - ( - 8 )

D = 9

y = ( - b ± √D ) / 2a

  = ( - 1 ± √9 ) / 2

  = ( - 1 ± 3 ) / 2

  = ( - 1 - 3 ) / 2, ( - 1 + 3 ) / 2

  = - 4 / 2, 2 / 2

y = - 2, 1

Answer 2

Answer:

y=1 or -2

Step-by-step explanation:

y²+y=2

=>y²+y-2=0

=>y²+(2-1)y-2=0

=>y²+2y-y-2=0

=>y(y+2)-1(y+2)=0

=>(y-1)(y+2)=0

THEREFORE,

either (y-1)=0

=>y=1

or (y+2)

=> y=-2

so either y=1 or y=-2