Question

using suitable identify 45cube-25cube-20cubr​

Answer 1

Answer:

67500

Step-by-step explanation:

Equation = $45^{3} - 25^{3} - 20^{3}$

$a = 45\\b = -25\\c = -20$

We will use the identity after verifying $a+b+c$

$a+b+c = 45+(-25)+(-20)$

$a+b+c = 45-25-20$

.°. $a+b+c = 0$

So, we will use the identity > $a^{3}+b^{3}+c^{3}=3abc$

Because, $a+b+c = 0$

.°. $45^{3} - 25^{3} - 20^{3} = 3(45)(-25)(-20)$

As - & - cancelled each other. So,

=> $3(45)(25)(20)$

=> $3(900)(25)$

=> $900(75)$

=> $67500$

Hence, $45^{3} - 25^{3} - 20^{3} = 67500$

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Hope it helps.

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Answer 2

Answer:

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Step-by-step explanation:

Etty DHL