We have to apply Discriminant Law. When a quadratic equation, ax² + bx + c = 0 has equal roots so the discriminant will be 0. Then, you have to substitute the values into the formula :

$D = {b}^{2} - 4ac$

$let \: D = 0 ,a = 2,b = k,c = k$

$0 = {k}^{2} - 4(2)(k)$

${k}^{2} - 8k = 0$

$k(k - 8) = 0$

$k = 0$

$k - 8 = 0$

$k = 8$

4 0

3 years ago

Abby buys 4 pencils and 2 erasers for 3.58. Michael buys 1 pencil and 6 erasers for 2.49. What is the cost of 1 pencil and 1 era

Dimas [21]

Answer:

pencils= .75 erasers= .29¢

Step-by-step explanation:

7 0

3 years ago

A small company had a loss of $425 in January. If it continues to have the same loss each month for 4 months, what will be the c

Tresset [83]

425(4)= 1700. After 4 months they would have lost $1700

3 0

3 years ago

Round the following numbers to 1 decimal place,

svetoff [14.1K]

A) 68.8

b) 5.9

c) 634.9

d) 90.0

4 0

3 years ago