Question

Please help in math I give lots of points.

Answer 1

`\text{Put the value of x to the expression}\\\\√(x+3);\ x=15\\\\√(15+3)=√(18)=√(9\cdot2)=\sqrt9\cdot\sqrt2=\boxed{3\sqrt2}`

`\text{Put the value of x to the expression}\\\\(6)/(√(x)),\ x=3\\\\(6)/(\sqrt3)=(6\cdot\sqrt3)/(\sqrt3\cdot\sqrt3)=(6\sqrt3)/(3)=\boxed{2\sqrt3}`

`\text{Put the value of x to the expression}\\\\4√(x+1)-3√(2x+6),\ x=3\\\\4√(3+1)-3√(2(3)+6)=4\sqrt4-3√(6+6)=4(2)-3√(12)\\\\=8-3√(4\cdot3)=8-3\sqrt4\cdot\sqrt3=8-3(2)\cdot\sqrt3=\boxed{8-6\sqrt3}`