x = -3.27 or -6.73
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-2-5
x2 + 10x + 21 = (x + 3)(x + 7)
For a start you tell us what the expression equals....
-6
x2+10x+1 = -12+2x x2+10x-2x+1+12 = 0 x2+8x+13 = 0 Solving by using the quadratic equation formula: x = - 4 - or + the square root of 3