Expand : (x-2)(x+4)....

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`(x-2)(x+4)`.

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`x^2+2x-8`

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Fill in the blanks : (x+4)(x-3)=x^2+(..........)x+(4)xx(.....)
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Fill in the blanks : (2x+5y)(2x+5y)=(2x)^2+(......)xx2x+(5y)^2
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Expand : (x-2)(x+4).
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Expand : (n-3)(n-7).
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Expand : (Use formulae) (28)^3
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Expand : (Use formulae) (23)^3
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Expand : (Use formulae) (x-y-3)^2
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Simplify : (Use formulae) (3x-7y)^3+(3x+7y)^3
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Simplify : (Use formulae) (5x-4)^3+(5x+4)^3
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Simplify : (Use formulae) (2a-3b+4c)^2-(2a+3b-4c)^2
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Simplify : (Use formulae) (4x-5y+6z)^2+(4x+5y-6z)^2
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