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Tamil Nadu Board of Secondary EducationHSC Science Class 11

Find the real roots of x4 = 16 - Mathematics

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Question

Find the real roots of x4 = 16

Sum

Solution

x4 = 16

⇒ x4 – 16 = 0

(i.e.,) x4 – 42 = 0

⇒ (x2 + 4)(x2 – 4) = 0

x2 + 4 = 0 will have no real roots

So solving x2 – 4 = 0

x2 = 4

x = `+-  sqrt(4)`

= `+-  sqrt(2)`

So the real roots are x = ± 2

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Chapter 2: Basic Algebra - Exercise 2.6 [Page 66]

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Samacheer Kalvi Mathematics - Volume 1 and 2 [English] Class 11 TN Board
Chapter 2 Basic Algebra
Exercise 2.6 | Q 3 | Page 66
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