if x=4,y=3,z=2,then show that 4x²+y²+25z²+4xy-10yz-20zx=1
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Answer:
It is true
Step-by-step explanation:
4(4)²+(3)²+25(2)²+4(4)(3)-10(3)(2)-20(2)(4) = 1
64+9+100+48-60-160 = 1
221-220 = 1
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