factorise this 21 x² -59xy +40y²
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Answered by
6
(21x - 40y)² = 21x²-59xy+40y²
because (a-b)²= a²-2ab+b²
because (a-b)²= a²-2ab+b²
Answered by
4
Answer:
(3x - 5y)(7x -8y)
Step-by-step explanation:
21x² - 59xy + 40y²
=21x² - 24xy - 35xy + 40y²
=3x(7x - 8y) - 5y(7x - 8y)
=(7x - 8y)(3x - 5y)
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