6x²+18x=0 4x²-9=0 x²-8x+7=0 3x²+5x+6=0

Question

6x²+18x=0
4x²-9=0
x²-8x+7=0
3x²+5x+6=0

Answer 1

6*6+18=54
4*4-9=-3
x2-8x+7=7
3*3=9+5+6=20 

Answer 2

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