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Author: Tinku Tara

Solve-S-n-1-2-2-3-2-2-4-2-3-n-2-n-1-

Question Number 134839 by SOMEDAVONG last updated on 07/Mar/21 $$\mathrm{Solve}\:,\:\mathrm{S}_{\mathrm{n}} =\:\mathrm{1}+\mathrm{2}×\mathrm{2}+\mathrm{3}×\mathrm{2}^{\mathrm{2}} +\mathrm{4}×\mathrm{2}^{\mathrm{3}} +…+\mathrm{n}×\mathrm{2}^{\mathrm{n}−\mathrm{1}} . \\ $$ Commented by mr W last updated on 07/Mar/21 $${see}\:{Q}\mathrm{134200}…

Question-69297

Question Number 69297 by ajfour last updated on 22/Sep/19 Commented by ajfour last updated on 22/Sep/19 $${If}\:{the}\:{graph}\:{is}\:{a}\:{cubic} \\ $$$$\:\:\:\:{y}={x}^{\mathrm{3}} +{ax}^{\mathrm{2}} +{bx}+{c} \\ $$$${find}\:{point}\:{of}\:{intersection}\:{of} \\ $$$${the}\:{red}\:{and}\:{blue}\:{lines}.…