factorize 9x2 + y2 +z2-6xy+2yz-6xz & find it's value when x=1, y=2, z=-1
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Answer:
42 is the answer of question
Step-by-step explanation:
9×2+(2)2+(-1)2-6(1)(2)+2(2)(-1)-6(1)(-1)
18+4+(-2)-6(2)+2(-2)-6(0)
22+(-2)(-12)-4-0
22+24-4
46-4
42
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