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5x² -2x+ 3 = ax² +(b+c) x + 7(6-c)
a= 5
b+c = -2
7(6-c)= 3 ---> 6-c = 3/7 --> c = 6 - 3/7 = 39/7
b+ c = 2
b = 2 - c --> b = 2 - 39/7 = - 25/7
2)
3x² + 5x -22 = (x +b)(x -2)
3x² +5x - 22 = x² +(b-2)x +(-2b)
3x² + 5x - 22 = 3 (x² +(b-2)x + (-2b)}
3x² + 5x - 22 = 3x² + 3(b-2) x + 3(-2b)
.
3(b-2) = 5 --> 3b = 5 + 6 --> b = 11/3
atau
-6b = -22--> b = 22/6 = 11/3