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schepotkina [342]
3 years ago
15

Find the sum of x^2 + 3x and 2x^2 + 9x + 5

Mathematics
1 answer:
Kazeer [188]3 years ago
8 0

Answer:

3 {x}^{2}  + 12x + 5

Step-by-step explanation:

(x^2 + 3x)  +  (2x^2 + 9x + 5) \\  \\  = x^2 + 3x  +  2x^2 + 9x + 5 \\  \\  =  {x}^{2}  + 2 {x}^{2}  + 3x + 9x + 5 \\  \\  = 3 {x}^{2}  + 12x + 5

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