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dexar [7]
3 years ago
15

Evaluate using f(x)= -5x+13, f(-2)=?

Mathematics
2 answers:
Naddik [55]3 years ago
7 0
F(x)=-5x+13
f(-2) can be found by replacing "x" with "-2", thus
f(-2)=-5(-2)+13=10+13=23
Bond [772]3 years ago
6 0
F(x) = - 5x + 13
f(-2) = - 5(-2) + 13
f(-2) = 10 + 13
f(-2) = 23
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7 0
3 years ago
HELP NEEDED IMMEDIATELY! I'M GETTING DESPERATE!
TiliK225 [7]

Answer:

The number of different possible values are {-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}.

Step-by-step explanation:

Given : For an integer n, the inequality  \[x^2 + nx + 15 < 0\]  has no real solutions in x.

To find : The number of different possible values of n ?

Solution :

The given inequality is   \[x^2 + nx + 15 < 0\] have no solution then the discriminant must be less than zero.

i.e. b^2-4ac

Here, a=1, b=n and c=15

{n}^{2}  - 4 \times 1 \times 15  \: <  \: 0

{n}^{2}  - 60  \: <  \: 0  

n^2

n

n

i.e. - 7.75 \:  <  \: n \:  <  \: 7.75

The integer values are {-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}.

7 0
3 years ago
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