Hey guys
Question:
If x = 1/3-✓8, find the value of x^3-2x^2-7x+5.
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It's very urgent please solve it correctly.
Answers
Answered by
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Answer:
49+16✓8
Step-by-step explanation:
x = 1/3-✓8
=(3+✓8)/(3-✓8)(3+✓8)
=3+✓8/9-8
x=3+✓8
=================
x²=(3+✓8)^2=9+8+6✓8=17+6✓8
x³= (17+6✓8) (3+✓8)
=51+17✓8+18✓8+6✓8*✓8
=51+35✓8+48
x³=99+35✓8
====================
Now x³-2x²-7x+5
=99+35✓8-2*(17+6✓8)-7(3+✓8)+5
=99+35✓8-34-12✓8-21-7✓8+5
=99-34-21+5+35✓8-19✓8
=49+16✓8
rimmisingh791:
Your answer is wrong
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