p + q
= - b / a
= - 1 / 1
= - 1
pq
= c / a
= - 4 / 1
x1 + x2
= ( 2p + 1 ) + ( 2q + 1 )
= 2p + 2q + 2
= 2 ( p + q )
= 2 ( - 1 )
= - 2
x1 × x2
= ( 2p + 1 ) ( 2q + 1 )
= 4pq + 2p + 2q + 1
= 4 ( - 4 ) + 2 ( p + q ) + 1
= - 16 + 2 ( - 1 ) + 1
= - 16 - 2 + 1
= - 17
x² - ( x1 + x2 ) x + x1x2 = 0
x² - ( - 2 ) x + ( - 17 ) = 0
x² + 2x - 17 = 0
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p + q
= - b / a
= - 1 / 1
= - 1
pq
= c / a
= - 4 / 1
x1 + x2
= ( 2p + 1 ) + ( 2q + 1 )
= 2p + 2q + 2
= 2 ( p + q )
= 2 ( - 1 )
= - 2
x1 × x2
= ( 2p + 1 ) ( 2q + 1 )
= 4pq + 2p + 2q + 1
= 4 ( - 4 ) + 2 ( p + q ) + 1
= - 16 + 2 ( - 1 ) + 1
= - 16 - 2 + 1
= - 17
x² - ( x1 + x2 ) x + x1x2 = 0
x² - ( - 2 ) x + ( - 17 ) = 0
x² + 2x - 17 = 0
tolong dijawab dengan cara