Work out the lengths of sides a and b. Give your answers to 1 decimal place.
17 cm
a
b.
8 cm
12 cm
5 cm

a ≈ 9.4, b ≈ 12.0

Step-by-step explanation:

Using Pythagoras' identity in the right triangles.

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides.

a² = 8² + 5² = 64 + 25 = 89 ( take the square root of both sides )

a = ≈ 9.4 ( to 1 dec. place )

b² + 12² = 17²

b² + 144 = 289 ( subtract 144 from both sides )

b² = 145 ( take the square root of both sides )

b = ≈ 12.0 ( to 1 dec. place )

4

step-by-step explanation:

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x