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3 years ago

Which point is an x interception of the quadratic function f(x)=(x-8)(x+9)

Mathematics

2 answers:

Lina20 [59]3 years ago

7 0

Answer:

I got (-9,0).

Step-by-step explanation:

viva [34]3 years ago

6 0

$f(x)=(x-x_1)(x-x_2)\\\\(x_1,\ 0),\ (x_2,\ 0)-x\ interceptions$

$\text{We have}\ f(x)=(x-8)(x+9)=(x-8)(x-(-9))\\\\\text{therefore your answer is:}\\\\(8,\ 0),\ (-9,\ 0)$

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Which expression has a value that is equivalent to 5n+13 when n= -5

maks197457 [2]

Answer:

Option A is correct.

4n + 8 expression which has a value that is equivalent to 5n+13 when n = -5

Step-by-step explanation:

Given the expression: $5n + 13$

If n = -5

then, by substituting in given expression we get;

$5(-5)+13 = -25+13 = -12$

Option A:

4n + 8

Substitute the value of n = -5 we have;

$4(-5) + 8 = -20 + 8 = -12$

Option B:

2n + 2

then;

2(-5) + 2 = -10 + 2 = -8

Option C :

$n^2+13$

then;

$(-5)^2+13 = 25 + 13 = 38$

Option D:

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then;

-5 + 8 = 3

Therefore, only option A has expression which has a value that is equivalent to 5n+13 when n = -5

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Answer:

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Step-by-step explanation:

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3 years ago

Y = −(x + 4)2 − 7 vertex

ICE Princess25 [194]

Answer:

The vertex (h,k) is (-4,-7).

Step-by-step explanation:

I assume you are looking for the vertex $y=-4(x+4)^2-7$ .

The vertex form of a quadratic is $y=a(x-h)^2+k$ where the vertex is (h,k) and a tells us if the parabola is open down (if a<0) or up (if a>0). a also tells us if it is stretched or compressed.

Anyways if you compare $y=-4(x+4)^2-7$ to $y=a(x-h)^2+k$ , you should see that $a=-4,h=-4,k=-7$ .

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