Evaluating Solutions Which solution shown below contains an error?
3 4
+
X
4
+
3x+4
1
1
1
ਤੇ ' ·
ਦਲੇਰ ' ਦੀ
ਲ - '
+
2
Y+2
+1
x+2
x+2
2.
8
10x-4
+
1-6)
2x-12
849
{x+1-6) (x+1)(-6)
+
+
+ 1
- 6
DONE

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Graph y = -|x| + 2. click on the graph until the correct one appears.

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