plz....i really beg you... please
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α² + β² can be written as (α + β)² - 2αβ
p(x) = 2x² - 5x + 7
a = 2 , b = - 5 , c = 7
α and β are the zeros of p(x)
we know that ,
sum of zeros = α + β
= -b/a
= 5/2
product of zeros = c/a
= 7/2
α + 4β and 4α + β are zeros of a polynomial.
sum of zeros = 4α + β+ α + 4β
= 5α + 5β
= 5 [ α + β]
= 5 × 5/2
= 25/2
product of zeros = (α + 4β)(4α + β)
= 2α [ 3α + 2β] + 3β [3α + 2β]
= 4α² + αβ + 16αβ + 4β²
= 4α² + 17αβ + 4β²
= 4 [ α² + β² ] + 17αβ
= 6 [ (α + β)² - 2αβ ] + 17αβ
= 6 [ ( 5/2)² - 2 × 7/2 ] + 17× 7/2
= 6 [ 25/4 - 7 ] + 119/2
= 6 [ 25/4 - 28/4 ] + 119/2
= 6 [ -3/4 ] + 119/2
= -18/4 + 119/2
= -9/2 + 119/2
= 110/2
= 55
a quadratic polynomial is given by :-
k { x² - (sum of zeros)x + (product of zeros) }
k {x² - 25/2x + 55}
k = 2
2 {x² - 25/2x + 55]
2x² - 25x + 110 -----> is the required polynomial
___________________________
HOPE IT HELPS ^_^
___________________________
α² + β² can be written as (α + β)² - 2αβ
p(x) = 2x² - 5x + 7
a = 2 , b = - 5 , c = 7
α and β are the zeros of p(x)
we know that ,
sum of zeros = α + β
= -b/a
= 5/2
product of zeros = c/a
= 7/2
α + 4β and 4α + β are zeros of a polynomial.
sum of zeros = 4α + β+ α + 4β
= 5α + 5β
= 5 [ α + β]
= 5 × 5/2
= 25/2
product of zeros = (α + 4β)(4α + β)
= 2α [ 3α + 2β] + 3β [3α + 2β]
= 4α² + αβ + 16αβ + 4β²
= 4α² + 17αβ + 4β²
= 4 [ α² + β² ] + 17αβ
= 6 [ (α + β)² - 2αβ ] + 17αβ
= 6 [ ( 5/2)² - 2 × 7/2 ] + 17× 7/2
= 6 [ 25/4 - 7 ] + 119/2
= 6 [ 25/4 - 28/4 ] + 119/2
= 6 [ -3/4 ] + 119/2
= -18/4 + 119/2
= -9/2 + 119/2
= 110/2
= 55
a quadratic polynomial is given by :-
k { x² - (sum of zeros)x + (product of zeros) }
k {x² - 25/2x + 55}
k = 2
2 {x² - 25/2x + 55]
2x² - 25x + 110 -----> is the required polynomial
___________________________
HOPE IT HELPS ^_^
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