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  • 11-04-2019
  • Mathematics
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Use the discriminant to determine which graph could represent the equation. y=x^2+4x+5

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kudzordzifrancis
kudzordzifrancis kudzordzifrancis
  • 20-04-2019
ANSWER

See attachment.

EXPLANATION

The given function is

[tex]y = {x}^{2} + 4x + 5[/tex]

When we compare this function to

[tex]y = a{x}^{2} + bx + c[/tex]

We have a=1, b=4 and c=5

We put this inside the formula for the discriminant, which is

[tex]D = {b}^{2} - 4ac[/tex]

[tex]D = {4}^{2} - 4(1)(5)[/tex]

[tex]D = 16 - 20 = - 4[/tex]

Since the discriminant is negative, the function has no x-intercepts.

The graph of this function is the one hanging in the air above the x-axis and opens upwards.
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