45.If x' +x+1, 2x +1, x²-1 are the sides of a triangle, then its larg

1.	45.If x' +x+1, 2x +1, x²-1 are the sides of a triangle, then its largest angle isTa)b)c) *2Td)32124.
Answer» Step-by-step EXPLANATION: GIVEN:- the angles of a TRIANGLE are ${x}^{2}+x+1,2x+1,{x}^{2}-1$ To FIND:- The largest angle Solution:- As we know that in a triangle ${\boxed{The\:sum\:of\:angles=180°}}$ According to formula ${x}^{2}+x+1+2x+1+{x }^{2}-1 =180$ ${:}\longrightarrow$ ${x}^{2}+{x}^{2}+x+2x+1+1-1=180$ ${:}\longrightarrow$ ${2x}^{2}+3x+1=180$ ${:}\longrightarrow$ $2x {}^{2}+3x-179=0$