Hyee guys. I need the answers fast and. Clearly explained. Plsssss. I have exams to morrow
If
Then find
pari200414:
plsss answer this.
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hi
x = 9 - 4√5
1/x = 1 / ( 9 - 4√5 )
=>
1/x = ( 9 + 4√5 ) /( 81 - 80)
=>
1/x = ( 9 +4√5 )
x = 9 - 4√5
1/x = 1 / ( 9 - 4√5 )
=>
1/x = ( 9 + 4√5 ) /( 81 - 80)
=>
1/x = ( 9 +4√5 )
wait i will explain
Multiply numnator and denominator by 9 + 4√5
Then numnator comes 9 + 4√5
and denominator comes. ( 9 + 4√5 ) × ( 9 - 4√5 )
= 9² - ( 4√5 )² = 81 - ( 16 × 5 ) = 81 - 80 = 1
ohhh. thanks.
becoz we know that ( a + b ) × ( a - b ) = a² - b²
yah
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