Expand using suitable identities:-4x^2+9y^2+16z^2+12xy-24yz-16xz
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(2x)^2+(3y)^2+(-4z)^2+2(2x)(3y)+2(3y)(-4z)+2(-4z)(2x)
=>(2x+3y-4z)^2
=>(2x+3y-4z)^2
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hope it will help you
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