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Lunna [17]
3 years ago
10

What is the value of x? Enter your answer in the box. x =

Mathematics
1 answer:
creativ13 [48]3 years ago
4 0

x=5

a^+b^=c^

a^+12^=13^

a^+144=169

a^=25

a=square root of 25

a=5

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3 years ago
There are two values of a for which the equation 5x2+ax+7x+5=0 has only one solution for x. What is the sum of those values of a
JulsSmile [24]

Answer:

-14

Step-by-step explanation:

First of all, we know that 5x^2+ ax+7x +5=0 only has one root. That means that b^2 - 4ac=0, and we can use this to find the discriminant, ax + 7x.

Now, if we simplified 5x^2+ ax+7x +5=0, by dividing it all by 5, it would be x^2+(a+7)/5x + 1 = 0.

After, we can plug what we know into the formula, b^2 - 4ac=0. It would be:

(a+7)^2 / 25 - 4 = 0

(a+7)^2 / 25 = 4

(a+7)^2 = 100

Since this is a square root, a+7 can be both negative or positive.

a+7= 10, or a+7 = -10

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The question asks for the sum of a, which is 3 + (-17) = -14

Therefore, the answer is -14.

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7 0
3 years ago
24) sin x = 1/3<br> Find cos x.
liq [111]

Answer:

\frac{2\sqrt{2} }{3}

Step-by-step explanation:

The sine of an angle is defined as the ratio between the opposite side and the hypotenuse of a given right-angled triangle;

sin x = ( opposite / hypotenuse)

The opposite side to the angle x is thus 1 unit while the hypotenuse is 3 units. We need to determine the adjacent side to the angle x. We use the Pythagoras theorem since we are dealing with right-angled triangle;

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\sqrt{9-1}=\sqrt{8}=2\sqrt{2}

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\frac{2\sqrt{2} }{3}

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IceJOKER [234]

Answer:

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Step-by-step explanation:

I'm Katie, I hope this helps you. :] , have a great day.

6 0
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