please help me!!!
someone is trying to kill me,
i have heard that his name is maths!
person who will save my life will get about 30 points.
please help me out .
question number 2 of question 5 .
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1) 4x² + 9y² + 16z² + 12xy -24yz - 16xz
= (2x) ² + (3y) ² +(-4)² + 2×2x ×3y + 2×3y ×(-4z) ×2x
= { 2x + 3y +(-4z)}²
= (2x + 3y -4z)(2x +3y-4z)
2) 2x² +y²+ 8z²- 2root2 xy + 4root2 yz –8zx
= (-2root)² + y² + (2root2 z) ² + 2(-root2)y + 2.y.(2root2 z) + 2.(2root2 z). (-2root 2)
=(-root2 x +y+ 2 root2 z) ²
=(-root2 x + y + 2 root2 z) (-root2x +y+ 2root 2 z)
= (2x) ² + (3y) ² +(-4)² + 2×2x ×3y + 2×3y ×(-4z) ×2x
= { 2x + 3y +(-4z)}²
= (2x + 3y -4z)(2x +3y-4z)
2) 2x² +y²+ 8z²- 2root2 xy + 4root2 yz –8zx
= (-2root)² + y² + (2root2 z) ² + 2(-root2)y + 2.y.(2root2 z) + 2.(2root2 z). (-2root 2)
=(-root2 x +y+ 2 root2 z) ²
=(-root2 x + y + 2 root2 z) (-root2x +y+ 2root 2 z)
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