Question

Find the sum of 5x2, -7x2, 8x2, 11x2 and -9x2​

Answer 1

Answer:

1. 10
2. -14
3. 16
4. 22
5. -18

Sum of all this is

    10 +(-14) + 16 + 22 + (-18)

=   10 - 14 + 16 + 22 - 18

=   10 - `14 + 38 - 18

=   -4 + 20

=    16

Answer 2

SOLUTION

TO DETERMINE

The sum of

$\sf 5 {x}^{2} , - 7 {x}^{2} ,8 {x}^{2} , 11 {x}^{2} , - 9 {x}^{2}$

EVALUATION

Here the given expressions are

$\sf 5 {x}^{2} , - 7 {x}^{2} ,8 {x}^{2} , 11 {x}^{2} , - 9 {x}^{2}$

Adding we get

$\sf 5 {x}^{2} + ( - 7 {x}^{2}) + 8 {x}^{2} + 11 {x}^{2} + (- 9 {x}^{2} )$

$\sf = 5 {x}^{2} - 7 {x}^{2}+ 8 {x}^{2} + 11 {x}^{2} - 9 {x}^{2}$

$\sf = (5 - 7 + 8 + 11 - 9) {x}^{2}$

$\bf = 8{x}^{2}$

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