Answer:
• discriminant: 73
• # of real solutions: 2
Step-by-step explanation:
Comparing the equation ...
2x^2 -9x +1 = 0
to the generic form ...
ax^2 +bx +c = 0
we find the coefficient values to be ...
a = 2; b = -9; c = 1
That makes the value of the discriminant, (b^2 -4ac), be ...
(-9)^2 -4(2)(1) = 81 -8 = 73
Since the discriminant is positive, the number of real solutions is 2.
You would -7 cents from the 1.50 so it was 1.43
Answer:
4
Step-by-step explanation:
f
−
1
(
2
)
=
4
Explanation:
Let
y
=
2
x
−
6
To get
f
−
1
(
x
)
, solve for
x
in terms of
y
:
y
=
2
x
−
6
y
+
6
=
2
x
1
2
y
+
3
=
x
or
x
=
1
2
y
+
3
Which means
f
−
1
(
x
)
=
1
2
x
+
3
Plugging in
x
=
2
gives
f
−
1
(
2
)
=
1
2
(
2
)
+
3
=
1
+
3
=
4
Answer:
Step-by-step explanation:
um