x2 - 14x + 45 = (x - 5)(x - 9).
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-3+-11 = -14 and -3*-11 = 33 So: x2-14x+33 = (x-3)(x-11) when factored
x2-14x+45=0(x-9)(x-5)=0x-9=0 & x-5=0x=9 & x=5
x2+14x+40 = (x+4)(x+10) when factored
x2-14x+24=(x-12)(x-2) Since there are no options listed in this question ;), the answer could be either "x-12" or "x-2". How to factor a trinomial: see link.
49 x2 + 14x = -7 x2 + 14x + 49 = 42 (x + 7)2 = 42 x = -7 ± √42