solve: (x+2)(x+3)(x+8)(x+12)=4x²
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Answer:
=>(x+2)(x+3)(x+8)(x+12)=4x
2
=>(x
2
+5x+6)(x
2
+20x+96)=4x
2
=>x
4
+20x
3
+96x
2
+5x
3
+100x
2
+480x+6x
2
+120x+576=4x
2
=>x
4
+25x
3
+202x
2
+600x+576=4x
2
=>x
4
+25x
3
+198x
2
+600x+576=0
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