Question

Find the value of the expression x3−y3+x2+y2+3 by substituting x=−2 and y=1.Find the value of expression the a3−3a2+5a−7 by substituting a=3.

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

Given expression = x³ - y³ + x² + y² + 3

Now substituting " x = - 2 and y = 1 ",we get

( - 2 )³ - ( 1 )³ + ( - 2 )² + ( 1 )² + 3

= - 8 - 1 + 4 + 1 + 3

= - 9 + 8

= - 1 is the answer.

Given expression = a³ - 3a² + 5a - 7

Now substituting " a = 3 " , we get

( 3 )³ - 3 ( 3 )² + 5 ( 3 ) - 7

= 27 - 27 + 15 - 7

= 15 - 7

= 8 is the answer.