Answer:-
x=17
step-by-step Step-by-step explanation:-
![{\boxed{\quad\:\mapsto\rm Firstly\:Let's\:understand\:the\:concept:-}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/79qov7ejjyjlc7i6wgaywjkr5qywxhkz4f.png)
This is a isosceles triangle. As it is a triangle we can apply sum theory. we have to take the sum of given unknown polynomials as 180° .Then by solving it we can find the value of x.
Solution:-
Given angles
According to sum theory
![{\boxed{\sf The \:sum\:of\:angles=180°}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/wp0jnptsnfjprqnivkx47a3swxbbtkh8ej.png)
![\qquad \quad{:}\longmapsto\tt (6x+10)+(x+17)+(4x-34)=180](https://img.qammunity.org/2021/formulas/mathematics/high-school/f4afo7eitv229or6lousjvlttmnzy4ia6w.png)
![\qquad \quad{:}\longmapsto\tt 6x+10+x+17+4x-34=180](https://img.qammunity.org/2021/formulas/mathematics/high-school/otbiqsqnwds7q9iyrl3w6nmn9fph4gfqdw.png)
- Together like polynomials and constants
![\qquad \quad{:}\longmapsto\tt 6x+x+4x+10+17-34=180](https://img.qammunity.org/2021/formulas/mathematics/high-school/1khxl5mf425oo8a293p0qvipkmeqpx3t8j.png)
![\qquad \quad{:}\longmapsto\tt 11x-7=180](https://img.qammunity.org/2021/formulas/mathematics/high-school/helh8jh0ojee3hn2081r16up53pjrn92ig.png)
![\qquad \quad{:}\longmapsto\tt 11x=180+7](https://img.qammunity.org/2021/formulas/mathematics/high-school/ucudcggk71r37e7uo5sfxgahtt9el1lqlb.png)
![\qquad \quad{:}\longmapsto\tt 11x=187](https://img.qammunity.org/2021/formulas/mathematics/high-school/vrjg3byjky88f7797on80ec7g1cprgwx7v.png)
![\qquad \quad{:}\longmapsto\tt x=\cancel{(187)/(11)}](https://img.qammunity.org/2021/formulas/mathematics/high-school/58yn8pvpuwkb7rajgcdm4vaazf7e89aiio.png)
![\qquad \quad{:}\longmapsto\tt x=17](https://img.qammunity.org/2021/formulas/mathematics/high-school/cptsbaewr8xknjg2odfo1p5iofze7fvpma.png)
![\therefore\sf The \:value\:of\:x\;is\:17.](https://img.qammunity.org/2021/formulas/mathematics/high-school/6le6fuw2mj89g8cjbzu5rjmjok9d6wbv7i.png)