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ANEK [815]
3 years ago
12

Solving Quadratic Equations

Mathematics
1 answer:
NISA [10]3 years ago
7 0

Answer:

a) x= 5 or x= -3

b) x = -4 + \sqrt{26} or -4 - \sqrt{26}

Step-by-step explanation:

a) x^{2} - 2x - 15 =0

x = \frac{-(-2) +\sqrt{(-2)^{2} - 4(1)(-15)}}{2(1)}  or  \frac{-(-2) -\sqrt{(-2)^{2} - 4(1)(-15)}}{2(1)}

x= 5 or x=-3

b) x^{2} + 8x - 10 =0

x = \frac{-(8) +\sqrt{(8)^{2} - 4(1)(-10)}}{2(1)}  or  \frac{-(8) -\sqrt{(8)^{2} - 4(1)(-10)}}{2(1)}

x = -4 + \sqrt{26} or -4 - \sqrt{26}

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Let f\left(x\right)=\frac{2}{x}f ( x ) = 2 x and g\left(x\right)=\frac{x}{x-1}g ( x ) = x x − 1. Find the domain of \left(\frac{
Black_prince [1.1K]

Answer:

The domain is  (-∞,0) ∪ (0,1) ∪ (1, +∞)

Step-by-step explanation:

In order to be able to compute f/g (x), we need that x is on the domain of f and in the domain of g.

f(x) = 2/x

In order to be able to compute f(x), we need that the denominator is different from 0, hence x≠0.

g(x) = x/x-1

In order to be able to compute g(x). we need x-1 to be different from 0, thus x≠1.

We also need the denominator of f/g (x) to be different from 0, hence g(x) ≠ 0. In order for g(x) = x/x-1 to be 0, the numerator x should be 0, as a result, we need x≠0 in order to have g(x) ≠ 0.

The domain of f/g (x) is every real nummber besides 0 and 1, in other words, it is (-∞,0) ∪ (0,1) ∪ (1, +∞).

6 0
4 years ago
Prove the identity: siny+tany/1+secy=siny
babunello [35]
That's easy I k ow the answer
4 0
3 years ago
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Scilla [17]

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Step-by-step explanation:

3 0
3 years ago
80 students at a particular school are randomly selected for a survey. 52 cat cereal for breakfast. If
rewona [7]

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Step-by-step explanation:

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8 0
3 years ago
1) (19-16), (-7,-15)​
max2010maxim [7]

Answer:

your answer is -285,112

Step-by-step explanation: first you do this

\frac{y1}{y2} \frac{x1}{x2} \\

the numders should go like this

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the answers to the multiplication

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the answer is

-285,112

4 0
3 years ago
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