Question

evaluate (10.4)square using identity pls help me

Answer 1

$\tt \green{we \: have \: to \: write \: 10.4 \: as \: 10 + 0.4}$

identity to use..

$(a + b) {}^{2} = {a}^{2} + {b}^{2} + 2ab$

so..

$\bf{(10 + 0.4) {}^{2} = {10}^{2} + (0.4) {}^{2} + 2(10)(0.4) }$

$\bf{(10 + 0.4) {}^{2} = 100 + 0.16 + 8 }$

$\bf \green{(10 + 0.4) {}^{2} = 108.16}$

Answer 2

Answer:108.16

Step-by-step explanation:(10.4)square= (10+0.4)square

(10.4)square= 10square + 2 x 10 x 0.4 + 0.4

= 100+8.0+0.16

=100+8.16

=108.16

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