Use the intersect method to solve the equation - 2x+1=-x^2+4

A) x=-1, 3

B) x=1, - 3

C) x=1

D) x=4

Question

Mathematics

Ernest

7 January, 07:16

Use the intersect method to solve the equation - 2x+1=-x^2+4

A) x=-1, 3

B) x=1, - 3

C) x=1

D) x=4

+4

Answers (1)

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Ernesto Gates · Answer 1

-2x+1=-x^2+4

X^2 - 2X + 1 - 4 = 0

X^2-2X-3=0

discriminant = (-2) ^2 - 4 (-3) (1)

=16

D1 = { - (-2) + √16}/2

D1 = (2+4) / 2

=6/2

D1=3.

D2={ - (-2) - √16}/2

= (2-4) / 2

=-2/2

D2 = - 1

the solutions are {-1; 3 }

so A) x = - 1,3

Use the intersect method to solve the equation - 2x+1=-x^2+4A) x=-1, 3B) x=1, - 3C) x=1D) x=4

Use the intersect method to solve the equation - 2x+1=-x^2+4

A) x=-1, 3

B) x=1, - 3

C) x=1

D) x=4