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x - y = 9
x + y = 21
2. -5x^2 + 7x - 11 = 8x^2 + 5x
-11 = (8+5)x^2 + (5-7)x
-11 = 13x^2 - 2x
13x^2 - 2x + 11
a = 13 b = -2 c = 11
x 1 = -(-2) + √((-2)^2 - 4(13)(11)) / (2(13))
x 1 = 2 + √(4 - 572) / (26)
x 1 = 1 + √-568 / 13
x 2 = 1 - √-568 / 13