Book Maths Puzzle Quadratic Equations

1. Solve the equation: 2x^3 + 6x= 8x^2

2. Explain why it is incorrect to solve the equation (y-2) (y+2) =4 by setting y-2=2 and y+2=2 and solving the resulting equations.

Tha

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Book Other Question

It takes an airplane 1h 30min to fly 600km aginst the wind. The return trip witht the wind takes only 1h. Find the total flying time for the round trip if there was no wind. What are the keysteps to prove the following geometry problem?



FIND THE RADIUS OF THE CIRCLE INSCRIBED IN THE TRIANGLE ABC.

GIVEN: AC=BC=12 AB=8