(a) Factorise: 9x² + 4y² + 16z² +12xy – 16 yz – 24xz
(b) Factorise: (25x² - 1)+(5x+1)²
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Answer:
Step-by-step explanation:
A)
Using identity
(a+b-c) ²=a²+b²+c²+2ab-2ac-2bc
9x²+4y²+16z²+12xy-16yz-24xz=
(3x+2y-4z) (3x+2y-4z)
B)
(5x+1) ²=25x²+1+10x
(25x²-1) +(25x²+1+10x) =
50x²+10x=10x(5x+1)
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