text: that one is easy if you can write the question correctly. Please write the question in a proper manner AND DON'T USE CAPITAL LETTERS IN THAT WAY. It only makes people's head dizzy if you use caps at every single letter of the question.\n\nx^2 + pq + q = 0\n(x - tan(15) )(x - tan(30) ) = 0\nx^2 - x * tan(30) - x * tan(15) + tan(15) * tan(30) = 0\nx^2 - x * (tan(30) - tan(15)) + tan(15) * tan(30) = 0\n\nThus:\npq = - x * (tan(30) - tan(15))\nq = tan(15) * tan(30)\n\nSubstitution. Insert q = ... into pq = ...\n\np (tan(15) * tan(30)) = - x * (tan(30) - tan(15))\np = [- x * (tan(30) - tan(15)) ] / [tan(15) * tan(30)]\n\nNow we know the value of p and q (although in variables), insert that into 2 + q - p\n\n2 + tan(15)*tan(30) - [-x*(tan(30)-tan(15))]/[tan(15)*tan(30)]\n\nWhew, confusing equation, let's just make tan(15)*tan(30) be A. And tan(30)-tan(15) be B.\n\n2 + A - [-x * B]/[A]\n\nNow this becomes a function. The solution is the function\nf(x) = 2 + A - [-x * B]/[A]\nwhere A = tan(15)*tan(30) = approx. -5.5493377957377570208698828633358\nand B = tan(30)-tan(15) = approx. 5.4829212349626777884063492759597\n\nor you can use several significant figure say three:\n\nf(x) = 2 - 5.55 - [-x * 5.48]/[-5.55]\nf(x) = -3.55 - [x * 5.48]/[5.55]