Answer:
y = -7, y = -3
Step-by-step explanation:
(y - 3)² = 2y² + 4y + 30
expand:
y² - 6y + 9 = 2y² + 4y + 30
subtract 30 from both sides
y² - 6y + 9 - 30= 2y² + 4y + 30 - 30
simplify:
y² - 6y - 21 = 2y² + 4y
subtract 4y from both sides
y² - 6y - 21 -4y = 2y² + 4y - 4y
simplify:
y² - 10y - 21 = 2y²
subtract 2y² from both sides
y² - 10y - 21 - 2y² = 2y² - 2y²
simplify:
-y² - 10y - 21 = 0
solve y by quadratic equation
- (-10) ± √ (-10² - 4(-1)(21)
y = --------------------------------------
2(-1)
y = -7, y = -3
3x^2-24x-21 would be your answer
The range is 30. To find the range, you subtract the largest number, which is 100, by the smallest number, which is 70.
Answer:
5 : 30
Step-by-step explanation:
Note that
× 10 = 5
Thus 3 × 10 = 30
Hence
: 3 = 5 : 30
Answer:
y=5/4x
Step-by-step explanation:
(A fraction)