7 3 2x 1 )= x 5 x 2 July 8, 2019 16 32 64 128 17 2 x 3 )+ 5 x 7 )- 3 2x 1 )=- 28 Prove 3 x 1 )( x 7 )-( 2x 5 2 is never positive 7 x 2 2x 3 1 x 2 5x 6 2x 1 5 x 2 3 x 7 15 3 7 2x )+( x 1 )- 5 2 x ≤ 2x 1 X 3 2x 1 5 7 2x 2 x 6 X 7 2x 5 1 x 3 3x 2 2 7(x - 5) + 1 = 2 - 3(2x - 1) 2) 1 + 7(x - 2) = 5(3 - 2x) + 3
