It is a quadratic expession and when factored is: (x-6)(x+7).
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42 + x2 = 13x ∴ x2 - 13x + 42 = 0 ∴ (x - 6)(x - 7) = 0 ∴ x ∈ {6, 7}
They are equal. 7 squared is 7 x 7, which equals 49. 6 x 7 = 42, plus another 7 = 49.
3060.
x[x+1] squared Simplified is, to my knowledge, x squared plus ( x + 1) squared
(a + x^2)(b + y^2)