Answers

2016-02-07T11:36:20+05:30
2x²+9x-56=0
doesnt have real roots so
x=9+ \sqrt{499} /4
0
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2016-02-07T12:37:37+05:30
Given equation : 2x² + 9x - 56 = 0
⇒ 2x² + 16x - 7x - 56 = 0
⇒ 2x(x + 8) - 7(x + 8) = 0
⇒ (x + 8) ( 2x - 7) = 0
⇒ (x + 8) = 0   or   (2x - 7) = 0
⇒ x = -8   or   2x = 7
⇒ x = -8   or   x = 7/2
∴ x = -8 , 7/2
2 5 2