1.

2x^2+5x-7=0... ...... . . ..

Answer»

ANSWER:

{2x}^{2}  + 5x - 7 = 0 \\  {2x}^{2}  + 7x - 2x - 7 = 0 \\ x(2x + 7) - 1(2x + 7) = 0 \\ (x - 1)(2x + 7) = 0 \\ x =  \: 1 \: and \: x =  \frac{ -7 }{2}



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