Question

239. If A = 3 m2 - 4m +1,B=5 m² + 3 m - 8 and C= 4m- 7m +3 , then find B+C -A.
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Answer 1

Answer:

The value of B + C - A is 6 (m² - 1).

Step-by-step explanation:

The value of A, B and C are:

$A=3m^{2}-4m+1\\B=5m^{2}+3m-8\\C=4m^{2}-7m+3$

Compute the value of B + C - A as follows:

$B + C - A=(5m^{2}+3m-8)+(4m^{2}-7m+3)-(3m^{2}-4m+1)\\=5m^{2}+3m-8+4m^{2}-7m+3-3m^{2}+4m-1\\=6m^{2}+0m-6\\=6(m^{2}-1)$

Thus, the value of B + C - A is 6 (m² - 1).