For Exercises 69–86, solve the quadratic equation by using any method. Write imaginary solutions in the form a + b i . (See Examples 8–11.) ( b − 1 ) ( b + 4 ) = ( 3 b + 2 ) ( b + 1 )
For Exercises 69–86, solve the quadratic equation by using any method. Write imaginary solutions in the form a + b i . (See Examples 8–11.) ( b − 1 ) ( b + 4 ) = ( 3 b + 2 ) ( b + 1 )
Solution Summary: The author calculates the solution of the quadratic equation by using any method.
For Exercises 69–86, solve the quadratic equation by using any method. Write imaginary solutions in the form
a
+
b
i
. (See Examples 8–11.)
(
b
−
1
)
(
b
+
4
)
=
(
3
b
+
2
)
(
b
+
1
)
Formula Formula A polynomial with degree 2 is called a quadratic polynomial. A quadratic equation can be simplified to the standard form: ax² + bx + c = 0 Where, a ≠ 0. A, b, c are coefficients. c is also called "constant". 'x' is the unknown quantity
In Exercises 34–37, solve each polynomial equation.
34. 3x? = 5x + 2
35. (5x + 4)(x – 1) = 2
36. 15x? – 5x = 0
37. x - 4x2 - x + 4 = 0
Exercises 105-120: Complete the following.
(a) Write the equation as ax² + bx + e = 0 with a > 0.
(b) Calculate the discriminant b² – 4ac and determine the
number of real solutions.
(c) Solve the equation.
105. 3x² = 12
106. 8x - 2 = 14
107. x² – 2x = -1
108. 6x² = 4x
109. 4x = x?
110. 16x + 9 = 24x
111. x² + 1 = x
112. 2x² + x = 2
113. 2x² + 3x = 12 – 2x 114. 3x² + 3 = 5x
115. x(x – 4) = -4
116. + 3x = x – 4
117. x(x + 2) = -13
118. 4x = 6 + x?
119. 3x = 1- x
120. x(5x – 3) = 1
The Mauna Loa Observatory in Hawaii records the carbon dioxide concentration y (in parts per million) in Earth’s atmosphere. The January readings for various years are shown in Figure . In the July 1990 issue of Scientific American, these data were used to predict the carbon dioxide level in Earth’s atmosphere in the year 2035, using the quadratic model y = 0.018t2 + 0.70t + 316.2 (Quadratic model for 1960–1990 data) where t = 0 represents 1960, as shown in Figure a. The data shown in figure b represent the years 1980 through 2014 and can be modeled by y = 0.014t2 + 0.66t + 320.3 (Quadratic model for 1980–2014) data where t = 0 represents 1960. What was the prediction given in the Scientific American article in 1990? Given the second model for 1980 through 2014, does this prediction for the year 2035 seem accurate?
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