15-02-2022
Mathematics

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Given A= 3x2 – 2x+5 and B is 3 less than twice A.
Find the sum of A and B.

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15-02-2022

Answer:

[tex]A+B=9x^2-6x+12[/tex]

Step-by-step explanation:

[tex]A=3x^2-2x+5\\B=2A-3\\\\B=2(3x^2-2x+5)-3\\B=6x^2-4x+10-3\\B=6x^2-4x+7\\\\A+B=(3x^2-2x+5)+(6x^2-4x+7)=9x^2-6x+12[/tex]

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