Step-by-step explanation:
so, it is a quadratic equation :
-3x² + 30x - 90 = 0
the first thing we can do is divide by 3
-x² + 10x - 30 = 0
remember, the formula to solve and find the 2 solutions is
x = (-b ± sqrt(b² - 4ac))/(2a)
in our case here
a = -1
b = 10
c = -30
x = (-10 ± sqrt(100 - 4×-1×-30))/-2 =
= (-10 ± sqrt(100 - 120))/-2 = (-10 ± sqrt(-20))/-2 =
= (-10 ± sqrt(4×5)i)/-2 = (-10 ± 2×sqrt(5)i)/-2 =
= 5 ± -sqrt(5)i
x1 = 5 - sqrt(5)i
x2 = 5 + sqrt(5)i
remember, i = sqrt(-1), a complex number.
Answer:
Step-by-step explanation:270 ez
Answer:
yo it took me 3 tires and 15 minutes, but i got it. like 5 seconds ago
Step-by-step explanation:
okay one is wrong this an 11/12, but i sped thru it to get the answers, you have to figure out which is incorrect
wendy
(cost)
5.99
wendy
(drink)
water
wendy
(food)
banana
frank
(cost)
6.99
frank
(drink)
milk
frank
(food)
apple
ruby
(cost)
7.99
ruby
(drink)
iced tea
ruby
(food)
iced tea
tom
(cost)
8.99
tom
(drink)
green tea
tom
(food)
mango
If 8x+6=4x+38
8x-4x=38-6
4x=32
x=32/4=8
Angle of A is equal to angle of B (mirrored)
Then angle of B is 4x+38 = 4*8+38 = 32+38=70
Answer:21v/22
Step-by-step explanation:
Circumference of a circle=2×π×radius
6v=2×22/7×r
7×6v=2×22×r
42v=44r
Radius=42v/44
Radius=21v/22
