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CBSE Class 9 Answered

if x+a is a factor of 2 x^2+2ax+5x+10 find a
Asked by 1937812326538158 | 05 Jan, 2018, 09:49: PM
answered-by-expert Expert Answer
begin mathsize 16px style Let space straight p left parenthesis straight x right parenthesis equals 2 straight x squared plus 2 ax plus 5 straight x plus 10 Since comma space left parenthesis straight x plus straight a right parenthesis space is space straight a space factor space of space straight p left parenthesis straight x right parenthesis comma straight p left parenthesis negative straight a right parenthesis equals 0 2 left parenthesis negative straight a right parenthesis squared plus 2 straight a left parenthesis negative straight a right parenthesis plus 5 straight a plus 10 equals 0 rightwards double arrow 2 straight a squared minus 2 straight a squared plus 5 straight a plus 10 equals 0 rightwards double arrow 5 straight a equals negative 10 rightwards double arrow straight a equals negative 2 end style
Answered by Rashmi Khot | 08 Jan, 2018, 01:53: PM

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