Category: Algebra

Question Number 154948 by mathdanisur last updated on 23/Sep/21 $$\mathrm{If}\overrightarrow{\mathrm{a}}=(-1;0;-3;4)$$$$\overrightarrow{\mathrm{b}}=(1;-4;0;-3)$$$$\overrightarrow{\mathrm{c}}=\frac{\mid \overrightarrow{\mathrm{a}}\mid }{\mid \overrightarrow{\mathrm{b}}\mid }\cdot (2\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}})$$$$\:\:\:\:\:\:\:\overset{\rightarrow} {\mathrm{d}}\:=\:\frac{\mid\overset{\rightarrow} {\mathrm{b}}\mid}{\mid\overset{\rightarrow}…

Question Number 89385 by pete last updated on 17/Apr/20 Commented by pete last updated on 17/Apr/20 $$\mathrm{I}\mathrm{need}\mathrm{help}\mathrm{on}\mathrm{the}\mathrm{above}\mathrm{question},\mathrm{please}.$$ Answered by Joel578 last updated on…

Question Number 154892 by mathdanisur last updated on 22/Sep/21 $$\mathrm{Find}:$$$$\cos \left(\frac{3\pi }{7}\right)+\cos \left(\frac{3\pi }{7}\right)\sqrt{2-2\cos \left(\frac{3\pi }{7}\right)}=?$$ Commented by MJS_new last updated on 23/Sep/21 $$\frac{1}{2}$$ Commented…

Question Number 89344 by jagoll last updated on 17/Apr/20 $${(2x-1)}^2+8\sqrt{2xy}=4$$$$4y-\sqrt{8xy-1}=1$$ Commented by john santu last updated on 17/Apr/20 $$\mathrm{8}{xy}−\mathrm{1}\:=\:\mathrm{16}{y}^{\mathrm{2}} −\mathrm{8}{y}+\mathrm{1}…

Question Number 89300 by I want to learn more last updated on 16/Apr/20 $$.$$ Commented by I want to learn more last updated…