(5a-3b)²-(2a-b)(4a-9b)=25a²+9b²-30ab-(8a²-4ab-18ab+9b²)=25a²+9b²-30ab-8a²+22ab-9b²=17a²-8ab=a(17a-8b)
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(5a-3b)²-(2a-b)(4a-9b)=25a²+9b²-30ab-(8a²-4ab-18ab+9b²)=25a²+9b²-30ab-8a²+22ab-9b²=17a²-8ab=a(17a-8b)