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X1,2 = -b +- √b²-4ac / 2a
= 7 +- √49-4(2)(-15) / 2(2)
= 7 +- √49+120 / 4
= 7 +- √169 / 4
= 7 +- 13 / 4
X1 = 7 + 13 /4
= 5
X2 = 7-13 /4
= -6/4