Question

Find the value of
x²+ 4y²+25z² - 4xy + 20 yz – 10xz, while x=9, y = 2 and z = 1
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Answer 1

$\bold{\small{⇒x²+ 4y²+25z² - 4xy + 20 yz – 10xz}}$

$\bold{\small{=(9)²+ 4(2)²+25(1)² - 4(9)(2) + 20(2)(1) – 10(9)(1)}}$

$\bold{\small{=81+ 16+25 - 72 + 40 – 90}}$

$\bold{\small{=162-162}}$

$\small{=}$$\bold{\small{\red{0}}}$

Answer 2

Answer:

0 is ur answer

Step-by-step explanation:

x²+4y²+25²-4xy+20yz-10xz

Putting the value

(9)²+4×(2)²+25×(1)²-4×9×2+20×2×1-10×9×1

81+16+25-72+40-90

162-162

=0 Answer