13) Solve each equation. State all solutions, real and imaginary. a. x* +5x2 -36 = 0 b. 3 + 2x2 + 25x + 50 = 0

College Algebra (MindTap Course List)
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ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter1: Equations And Inequalities
Section1.1: Linear Equations And Rational Equations
Problem 32E
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13) Solve each equation. State all solutions, real and imaginary.
a. x* +5x2 – 36 = 0
b. 3 + 2x2 + 25x + 50 = 0
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Transcribed Image Text:13) Solve each equation. State all solutions, real and imaginary. a. x* +5x2 – 36 = 0 b. 3 + 2x2 + 25x + 50 = 0 Answer: Answer:
Expert Solution
Step 1

Solve each equation.State all solutions,real and imaginary.

(a)   x4+5x2-36=0     

  x22+5x2-36=0

 Let x2=y,then

   y2+5y-36=0 y2+9-4y-36=0 y2+9y-4y-36=0 yy+9-4y+9=0 y-4y+9=0 y-4=0   or   y+9=0 y=4     or    y=-9Substitute y=x2  x2=4   or   x2=-9  x=±2  or   x=±3iHence,the real roots are 2,-2, and imaginary roots are 3i,-3i

     

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