1) <span>x^2-x-42=(х-7)(х+6)</span>
<span>2)<span>y^2+9y+18=(y+3)(y+6)</span></span>
<span><span>3)<span>81x^2+18x+1=(9х+1)^2</span></span></span>
<span><span><span>4) </span></span></span>
<span><span><span><span>5) <span>6x^2-x-1=(2х-1)(3х+1)</span></span></span></span></span>
<span><span><span><span><span>6) <span>3a^2-13a-10=(a-5)(3a+2)</span></span></span></span></span></span>
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</span></span></span>