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d/dx (3x+25)=3
10 -3x+8x = 25 -3x+8x = 25-10 5x = 15 x = 3
3X + 7 = 25 subtract 7 from each side 3X + 7 - 7 = 25 - 7 3X = 18 divide each sides integers by 3 (3/3)X = 18/3 X = 6 --------------check in original equation 3(6) + 7 = 25 18 + 7 = 25 25 = 25 -------------checks
If: 8x-4 = 3x+21 Then: 8x-3x = 21+4 => 5x = 25 => x = 25/5 Therefore: x = 5
9x2 + 30x + 25