12*13=156
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X-12=13+12 +12x=2525
13 ? 15
-7+x=13x the -7=12x and x =-7/12
Because 3 x 4 = 12
x2+ 2x = 12 (complete the square) x^2 + 2x + 1 = 12 + 1 (x + 1)^2 = 13 (square root of both sides) x + 1 = ±√13 (subtract 1 to both sides) x = ±√13 - 1 x = √13 - 1 or x = -√13 - 1 x= 2.6 or -4.6