3 years ago

Identify the vertex of each function please help

Mathematics

1 answer:

Svetlanka [38]3 years ago

8 0

Answer:

12. (4, 7)

13. (5, -1)

Step-by-step explanation:

Rewrite in vertex form and use this form to find the vertex (h, k).

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adoni [48]

answer:

(a).

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(b).

(-5, 0) » yes

(√7, 1) » no

(-3, √21) » no

(0, 7) » no

Step-by-step explanation:

(a).

If centred at origin, centre is (0, 0)

General equation of circle:

${ \boxed{ \bf{ {x}^{2} + {y}^{2} + 2gx + 2fy + c = 0}}}$

but g and f are 0:

${x}^{2} + {y}^{2} + c = 0 \\ but : \\ c = {g}^{2} + {f}^{2} - {r}^{2} \\ c = { - 25}$

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Work:
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