a. -
b. (X+2)(X-4)= X²+4X-2X-8= X²+2X-8=0
c.(X-7)(X-2)= X²-2x-7x+14= x²-9+14=0
d.(x-2) (x+1)= x²-1x-2x-2= x²+x-2=0
e. -
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a. -
b. (X+2)(X-4)= X²+4X-2X-8= X²+2X-8=0
c.(X-7)(X-2)= X²-2x-7x+14= x²-9+14=0
d.(x-2) (x+1)= x²-1x-2x-2= x²+x-2=0
e. -