Solve x4 – 13x2 + 42 = 0
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The answer of this question is = 60
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Answer:
x⁴-13x²+42=0
x⁴-7x²-6x²+42=0
x²(x²-7)-6(x²-7)=0
(x²-7)(x²-6)=0
_____________.
•°• x²-7=0
x²=7.
x=√7
x²-6= 0
x= √6
•°• { √7,√6}
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