Question

find the value using formula (2.89)3+(2.11)3+15*2.89*2.11

The 3 will be in power or like this (2.89)whole cube

Pls tell the answer I can't understand how to do pls ​

Answer 1

Answer:

125

Explanation:

On simplification,

(2.89)³+(2.11)³+15×2.89×2.11

=24.137569+9.393931+43.35×2.11

=33.5315+91.4685

=125.

or, [another method]

(2.89)³+(2.11)³+15×2.89×2.11

=(2.89)³+(2.11)³+3×5×2.89×2.11

=(2.89)³+(2.11)³+{3×(2.89+2.11)×2.89×2.11}

Let 2.89=a & 2.11=b,

=a³+b³+{3×(a+b)×a×b}

=a³+b³+3ab(a+b)

=(a+b)³

Putting the values of a & b,

=(2.89+2.11)³

=5³

=125

Hope it helps you...

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Answer 2

Answer:

the answer is 24.137 + 9.393 + 91.468 =

124.998

Explanation:

the cube of 2.89 is 24.137

the cube of 2.11 is 9.393

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