Untitled-22 - I{ERJCHh&L(3F‘SIBHELEIBILACEHTTS a(b c...

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Unformatted text preview: I{ERJCHh&L(3F‘SIBHELEIBILACEHTTS a(b+c) = axb+axc ab+ac albic) = abiac 3(2x+1) = 3x2x+3><1 : 6x+3 4(2x2—7x+1)= 4x2x2—4x7x+4x1 = 8x2—28x+4 3&9 figure in front of brackets is multiplied by both figures inside: a(b—c) = aXb—axc = ab—ac —3xx2—3x—5x—3x—7 —3x2+15x+21 5(x+2)—3(x—3)=5><x+5><2~3><x—3><—3 Example: ~(x—2) =5x+10—3x+9 =2x+19 THE ‘MINUS-ONE ’ TRICK — 1(x — y) <— If there is no number outside the brackets, place a ‘1’ there. —1><x——1><y ~x+y y-x i.e. ~(x—y) = y~x Example: —5x—(2x—1) ~5x+1—2x 1—7x ...
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  • Winter '10
  • golishr

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