y equals x plus 4
when y equals 0 then x equals 2i
i is the square root of negative 1
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Assuming the thing is as written and there are no brackets missed out then it is just 4 squared times 3 = 16x3=48.
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.
(x + 4)(x +4) or (x + 4)squared
2.5 + 3.4 Pythagorean Theorem?
4, -5