Question

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Answer 1

Question 1 :

Subtract the sum of (4y² - 6y) and (-2y²+3y-3) from the sum of (5y+7) and (3y²-9y+2).

Answer:

=> {(5y+7)+(3y²-9y+2)} - {(4y²-6y)+(-2y²+3y-3)}

=> { 5y+7+3y²-9y+2 } - { 4y²-6y-2y²+3y-3 }

=> { 3y² - 4y + 11} - { 2y² - 3y - 3 }

=> 3y² - 4y + 11 - 2y² + 3y + 3

=> y² - y + 14

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Question 2:

If a = 7 and b = 11, then what is the value of the expression obtained on subtracting {(2a-3b)-(a-b)} from {(11a+7b)-5b}.

Answer:

=> {( 11a + 7b) - 5b} - {( 2a - 3b) -(a - b)}

=> Now, Putting the values of a=7 and b=11.......

=> {( 11×7 + 7×11) - 5×11} - {( 2×7 - 3×11) - ( 7-11 )

=> { 77 + 77 - 55 } - { 14 - 33 + 4 }

=> { 99 } - { -15 }

=> 99 + 15

= 114

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