Discriminant =
b² - 4ac
3² - 4(2)(- 9)
9 + 72
81
Your equation has two real solutions.
2x² + 3x - 9 = 0
2x² + 6x - 3x - 9 = 0
2x(x + 3) - 3(x + 3) = 0
(2x - 3)(x + 3) = 0
Set each equal to zero:
2x - 3 = 0
2x = 3
x = 3/2
x + 3 = 0
x = - 3
Your two solutions are x = - 3, 3/2
7.85 meters = 785 centimeters. To convert from meters to centimeters, you just need to multiply the value in meters by 100 (the conversion factor).
Example, 7.85 meters = 7.85 × 100 = 785 centimeters.t 7.85 meters to centimeters
Happy studying ^-^
Answer:
3 and 3/4 miles per hour
Step-by-step explanation:
1/5 and 3/4 cross multiply and = 15/4
simplified to 3 and 3/4
Answer:
x= -19
y= -14
Step-by-step explanation:
Substitution.
It tells you what y is already. You substitute that into the second equation and then solve. Then you use that answer and substitute it back into the first equation's x, and then you'll get your full answer.
Hope this helps <3
