А-4 б-1 в-2
думаю что это так
P²-4p+4-p²-2p+3p+6=-3p+10
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<span>6 * х + 5 *(х-2)=3х(х-2)</span>
<span>6x+5x-10=3x²-6x</span>
<span>3x²-17x+10=0</span>
<span>D=289-120=169</span>
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<span><span>3*х+8*(х-5)=2х*(х-5)</span></span>
<span><span>3x+8x-40=2x²-10x</span></span>
<span><span>2x²-21x+40=0</span></span>
<span><span>D=441-320=121</span></span>