Teaching BSSTET Special Educator (Paper 1 & 2) Mock Test 2024 Quantitative Aptitude Number System Multiples and Factors

যদি 5x2 - 8y - 20x + 2xy = (x + a) (bx + 2y) হয়, তাহলে (a - b) এর মান কত হবে?

1
9
2
 -1
3
-9
4
1
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