4.8 Applications

Ex 1 The hypotenuse of a right triangle measures 20 cm. The sum of the lengths of the other two sides is 28 cm. Find the lengths of these two sides.

Ex 2 A photograph that was originally 15 cm by 10 cm was cropped by removing the same amount from the top and left side. Cropping reduced the area by 46 cm². What are the dimensions of the cropped photograph?

Ex 3 Solve the system of equations

f(x) = –2x² – 5x + 20

g(x) = 6x – 1

p. 293#10, 12, 13, 14, 17

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