ICSE Class 10 Answered

solve x^2 - 4x+ 16

plz tell me any particular formula for this type of questions.

Asked by pranu_gupta | 14 Dec, 2015, 11:54: AM

Expert Answer

C o n s i d e r space t h e space e q u a t i o n comma space x squared minus 4 x plus 16 L e t space u s space s o l v e space t h i s space b y space t h e space m e t h o d space o f space q u a d r a t i c space f o r m u l a. H e r e comma space a equals 1 comma space b equals negative 4 space a n d space c equals 16 W e space k n o w space t h a t comma x equals fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction T h u s comma space s u b s t i t u t i n g space t h e space v a l u e s comma space f o r space a comma space b space a n d space c comma space w e space h a v e comma x equals fraction numerator negative open parentheses negative 4 close parentheses plus-or-minus square root of open parentheses negative 4 close parentheses squared minus 4 cross times 1 cross times 16 end root over denominator 2 cross times 1 end fraction space space equals fraction numerator 4 plus-or-minus square root of 16 minus 4 cross times 16 end root over denominator 2 end fraction space space equals fraction numerator 4 plus-or-minus square root of negative 3 cross times 16 end root over denominator 2 end fraction H e r e comma space t h e space d i s r i m i n a n t comma space b squared minus 4 a c less than 0 T h u s space t h e space r o o t s space a r e space n o t space r e a l space a n d space a r e space i m a g i n a r y.

Answered by Vimala Ramamurthy | 15 Dec, 2015, 08:41: AM

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