Which equation has the solutions x= 5 ± 2 square root 7 all over 3
1. 3x2 – 5x + 7 = 0
2. 3x2 – 5x – 1 = 0
3. 3x2 – 10x + 6 = 0
4. 3x2 – 10x – 1 = 0

  4.  3x^2 – 10x – 1 = 0

Step-by-step explanation:

You can write the quadratic from the roots:

  0 = (x - (5-2√7)/3)(x - (5+2√7)/3)

  = (x -5/3)^2 -(2√7/3)^2

  = x^2 - 10/3x +25/9 -28/9

  = x^2 -10/3x -1/3

Multiplying by 3 gives ...

  0 = 3x^2 -10x -1

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40