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2x + (10x - 4) = 20 2x + 10x - 4 = 20 12x - 4 = 20 12x = 24 x = 2
Use algebra. 12x+30=15x-20. Add 20 to both sides. 12x+50=15x. Subtract 12x from both sides. 50=3x. Divide both sides by 3. 16.666...=x
If you mean: x^2 +12x +20 then it is (x+2)(x+10) when factored
If you want this in the form y=mx+c so that you can draw a straight-line graph, 12x + 4y-20 = 4 4y=-12x+24 /4: y=-3x+6 gradient is 3, y intercept at x=6
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