Question

use identiry to solve (8.9) 2 .
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Answer 1

Step-by-step explanation:

17.8

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Answer 2

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use identiry to solve (8.9) 2 .

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$we \: can \: write \: {(8.9)}^{2} \: as \: {(9.0 - 0.1)}^{2}$

$identity \: = \\ {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2}$

$x = 9 \\ y = 0.1$

$substitute \: the \: values$

${(9 - 0.1)}^{2} = {(9)}^{2} - 2(9)(0.1) + {(0.1)}^{2}$

${(9 - 0.1)}^{2} = 81 - 1.8 + 0.01$

${(9 - 0.1)}^{2} = 81.01 - 1.8$

${(9 - 0.1)}^{2} = 79.21$

${\boxed {\boxed {= 79.21}}}$

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