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ICSE Class 10 Answered

x^4+5x^2-36=0
Asked by prarenupall8070 | 21 Aug, 2018, 19:32: PM
answered-by-expert Expert Answer
x4 + 5x2 - 36 = 0
x2 = m
m2 + 5m - 36 = 0
m2 + 9m - 4m - 36 = 0
m(m + 9) - 4(m + 9) = 0 
(m + 9) (m - 4) = 0 
m = -9 or m = 4
x2 = - 9 which is not possible.
Hence, x2 = 4 
x = ± 2
 
Answered by Sneha shidid | 23 Aug, 2018, 09:56: AM

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