exam
Maths Puzzle
Numerical Ability
(3 - 7i)(2 + 4i),firstly,you expand it.(this is complex number),
(6 +12i - 14i +28 ) = 34 - 2i.ans(note: i^2 = -1.so -7i x +14i =28)
SOLVED BY JAMES(A.K.A, BOMBARD)
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What do I do? Please help me?
Multiply, using the vertical method.
(m^2 - 5mn + 3n^2)(m^2 + 4mn -2n^2)
7c(8c+7)=3c-15