1.

If A=5x²+7 x+8 and B=4x² -7x+3,find 2A - B​

Answer»

Step-by-step EXPLANATION:

a = 5 {x}^{2}  + 7x + 8 \\b =  4 {x}^{2}   - 7x + 3 \\ 2a - b =2( 5 {x}^{2}  - 7x + 8) - (4 {x}^{2}  - 7x + 3) \\  =  10 {x}^{2}  - 14x \:  + 16 - 4 {x}^{2}  + 7x - 3 \\  = 6 {x}^{2}  - 7x + 3



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