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Gwar [14]
2 years ago
15

URGENTE, PERGUNTAS DE MARCAR:

Mathematics
1 answer:
Norma-Jean [14]2 years ago
3 0

Answer:

2a: (c)

5o: (1, 3) and (1,1)

3a: (b)

1a: (d)

4o: (b)

Step-by-step explanation:

2a: the equation of a circle circumference needs to be transformable to the form (x-x_C)^2 + (y - y_C)^2 = r^2 where C(x_C; y_C) is the center and <em>r</em> is the radius. (a) and (d) can’t be it because they contain non-zero factors on <em>xy</em>. (b) isn’t an equation.

5o: just put the given (<em>x</em>, <em>y</em>) into the equations and see if it holds. (2, 3) isn’t on the circumference of (1) because 2^2+3^2-2\cdot 2 -4\cdot 3 + 4 = 1 \neq 0, (3, 1) isn’t on it either because 3^2 + 1^2 - 2\cdot 3 - 4\cdot 1 + 4 = 4 \neq 0.

3a: calculate the value of the left-hand side term of the equation using (<em>x</em>, <em>y</em>) from the given point <em>M</em>. That’s the difference of square distance to the center to the square radius r^2. Thus it’s 0 if the point is on the circumference, negative if inside and positive if outside. You get 3^2 + 4^2 - 6\cdot 3 -2\cdot 4 + 8 = 7, positive, so it’s outside the circle.

1a: see definition from 2a. Here, r^2 = 9.

4o: insert the y from the straight line equation (r) (which can be equivalently transformed to y = x+1) into the circumference equation. If it yields no solution, that’s outside, it there’s exactly one solution, that’s a tangent and if there are two solutions, it’s a secant. x^2+(x+1)^2+2x - 4(x+1) = x^2 + x^2 + 2x + 1  + 2x - 4x + 4 = 2x^2 + 5 = 0 \iff x^2 = 2.5 \iff x \in \{-\sqrt{2.5}, \sqrt{2.5}\} There are two solutions, so it’s a secant.

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