Mathematics, 03.05.2021 20:10 skatelife8974
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Madelyn states that the value of the expression-2/3 x2 + x + 7 3/4 is sometimes negative. Which of the following values of x support Madelyn's claim
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Mathematics, 20.06.2019 18:04
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?
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Madelyn states that the value of the expression-2/3 x2 + x + 7 3/4 is...
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