Question

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Answer 1

(1) 5a - 7b + 7 and -4a - 7 + 4b

★ Sum of (5a -7b + 7 ) and ( -4a - 7 + 4b)

=> 5a - 7b + 7 + ( -4a - 7 + 4b )

=> 5a - 7b + 7 - 4a - 7 + 4b

=> 5a - 4a - 7b + 4b + 7 - 7

=> ( a - 3b )

★ Sum of ( 9a - 7 - 2b ) and ( 14b -2a + 4)

=> ( 9a - 7 - 2b ) + ( 14b - 2a + 4).

=> 9a - 7 - 2b + 14b - 2a + 4

=> 9a - 2a - 2b + 14b - 7 + 4

=> 7a + 12b - 3.

★ Subtracting ( a - 3b ) from ( 7a + 12b - 3 ).

=> ( 7a + 12b - 3 ) - ( a - 3b )

=> 7a + 12b - 3 - a + 3b

=> 7a - a + 12b + 3b - 3

=> 6a + 15b - 3 [ Answer ]

(2). ( a ) X = -2

P ( x ) = 5X² + 2X - 2

Substitute X = -2 in P ( x ).

P (2) = 5 × (2)² + 2 × 2 - 2

=> 5 × 4 + 4 - 2

=> 20 + 4 - 2

=> 24 - 2

=> 22

(b ) m = -3

M³ - 2 ( m - 3 ) + 4

Substitute m = -3 in ,

m³ - 2 ( m - 3 ) + 4

(-3)³ - 2 ( -3 - 3 ) + 4

-27 - 2 × ( -6 ) + 4

-27 + 12 + 4

-27 + 16

-11