User:Kudx20

ANSWERS TO OTHER BASIC ADVANCED LEVEL MATHEMATICS

1(i) | x + 7 | = | x - 18 |    [ |a| = -a or +a ] - (x+7) = (x-18)       use different signs 25   =  2x 12.5  =  x

(ii) | 4^y + 7 | = | 4^y - 18 | [ note only x changes to 4^y ↔ solve for 4^y = x ] log 4^y = log x    [ x = 12.5 ] y log 4 = log 12.5 y = log 12.5 / log 4 CALCULATOR y =  1.82   to 2s.f