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iren2701 [21]
3 years ago
9

The equation 3x square -12x+(n-5)=0 has equal roots find the value of n​

Mathematics
1 answer:
ELEN [110]3 years ago
7 0

Answer:

n = 17

Step-by-step explanation:

For a quadratic equation to have equal roots b²-4ac should be equal to zero in the quadratic equation ax²+bx+c=0.

Equation : 3x² - 12 x + ( n - 5) = 0

a = 3, b = -12, c = ( n - 5)

b² - 4ac = 0

(-12)² - (4 x 3 x (n - 5)) = 0

144 - 12( n - 5 ) = 0

12( n - 5 ) = 144

n - 5 = 12

n = 17

Check if it's true :

3x² - 12 x + ( 17 - 5) = 0

3x² - 12 x + 12 = 0

3(x² - 4x + 4) = 0

(x² - 4x + 4) = 0

(x - 2)(x - 2) = 0

x = 2 , 2

Equal roots .

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Luden [163]

Answer:

Pablo decides to save his money in a piggy bank and each day he saves $ 100 more than the day before. How much would he save on day "20" if he had $ 100 on the first day? Express the function and solve

Step-by-step explanation:

5 0
3 years ago
There were 25 words on a recent vocabulary test in English class, and Owen got four words wrong. What percent did he get wrong?
USPshnik [31]
16 % ;  4 / 25 =  16 / 100
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3 years ago
How do the expressions 72 divided and -72divided by (-9) and compare when they are evaluated?
padilas [110]

Complete question is;

How do the expressions 72 divided by 9 and -72 divided by (-9) compare when they are evaluated?

A. They have different values and are different signs.

B. They have different values but are the same sign.

C. They have the same value but are different signs.

D. They have the same value and the same sign

Answer:

D. They have the same value and the same sign

Step-by-step explanation:

For 72 divided by 9,it is;

72/9 = 8

Usually when we don't have any sign in front of a number, it is said to be positive.

Thus, the answer can be expressed as; +8

Also, when -72 is divided by (-9), it is;

-72/-9

The negative signs will cancel out to give; 8

Similar to the first division, since no sign is attached to 8,it is said to be positive as +8.

This means both divisions yield same values and same signs

5 0
3 years ago
Combine like terms to write an equivalent expression for <br><br> 2( 4y^2 + 6x - 2y^2 + 12x.)
natima [27]
8y^2 + 12x - 4y^2 + 24x
= 4y^2 + 36x
3 0
3 years ago
Simplify and solve for the given variable. <br>Solve 19x = 3 + 4(x + 6) - 2<br>for X.​
Rom4ik [11]

Answer:

5/3

Step-by-step explanation:

19x=3+4(x+6)-2

19x=3+4x+24-2

19x-4x=3+24-2

15x=27-2

15x=25

x=25/15

simplify

x=5/3

5 0
4 years ago
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