Question

Find x: 20 – 2(5 – p) = 8

Answer 1

Expanding the bracket,

20 – 2 × 5 – 2 × (– p) = 8

20 – 10 + 2p = 8 ....(– 2 × – p = 2p)

10 + 2p = 8 transposing to other side

2p = 8 – 10 = – 2

∴ 2p = – 2

∴ p = – 1