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itani
itani itani
  • 19-05-2014
  • Mathematics
Answered

which of the following have both 2 and -5 as solutions.

Ax2 + 3× - 10 = 0
Bx2- 3x -10=0
Cx2 + 7× +10=0
Dx2 -7x +10=0

Verified Answer :

Anonymous Anonymous
  • 19-05-2014

\(x_1=2;\ x_2=-5\\\\(x-2)(x-(-5))=(x-2)(x+5)=x^2+5x-2x-10=x^2+3x-10\\\\Answer:a.\)

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kate200468
kate200468 kate200468
  • 19-05-2014

\(x_1=2\ \ \ and\ \ \ x_2=-5\\\\ \Rightarrow\ \ \ (x-x_1)(x-x_2)=(x-2)(x+5)=x^2+5x-2x-10=\\\\.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ =x^2+3x-10\ \ \ \Rightarrow\ \ \ Ans.\ a.\)

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