multiply (2x² + 3y²) (5x² - 7y²) please explain step by step and this is of class 7th
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(2x² +3y²) ( 5x²-7y²)
(2x²*5x²-7y²) + ( 3y² * 5x² -7y²)
(10x^4 - 14x²y²) + ( 15x²y² - 21y^4)
10x^4 + x²y² - 21y^4 .
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