Question

Apa koefisien A dari 5x + 7 = A (x + 3) + B (x - 1 )

Answer 1

5x + 7 = (A + B)x + 3A - B
A + B = 5
3A - B = 7
________ +
4A = 12
A = 3
B = 2

Answer 2

5x + 7 = Ax + 3A + Bx - B
5X + 7 = (A+B)X + 3A-B

5= A+B
A=5-B
B=5-A

7=3A-B
3A=7+B
3A=7+5-A
4A=12
A=3