38 pts BRAINLIEST HELP ASAP

Choose the correct sum of the polynomials (3x2 - 5x-8)+(5x + 7x + 3).
8x2 + 2x + 5
28 - 12x-11
2x² + 12x-5
8x + 2x-5

d

Step-by-step explanation:

3x³ - 5x - 8 + 5x³ + 7x + 3 = 3x³ + 5x³ -5x + 7x -8 +3

= 8x³ + 2x - 5

Add/ subtract the like terms. Like terms has same power of x

Step-by-step explanation:

First we have to divide the figure into 2 rectangles.

Area of rectangle 1= L*B

9*4=36cm2

Area of rectangle 2=L*B

18*5=90cm2

Total area =36+90=126cm2

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