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kipiarov [429]
3 years ago
7

Also this question tooo pleease, PS: what topic is this Solve for x.

Mathematics
1 answer:
MrRissso [65]3 years ago
8 0

This falls under geometry. The two labeled angles are congruent, which means the line segment between them (AD in the image) is a bisector of the angle at vertex A. Use the angle bisector theorem, which says that

\dfrac{BD}{DC}=\dfrac{AB}{AC}\iff\dfrac{12}{(5+9x)-12}=\dfrac{15}{25}

\dfrac{12}{9x-7}=\dfrac35

20=9x-7

x=3

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