Factorise 25(a+b)² -16(a-b)²
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25(a+b)² - 16(a-b)²
=5²(a+b)² - 4²(a-b)²
=(5(a+b))² - (4(a-b))²
= (5a+5b)² - (4a-4b)²
= [(5a+5b)+(4a-4b)][(5a+5b)-(4a-4b)]
=(5a+5b+4a-4b)(5a+5b-4a+4b)
=(9a+b)(a+9b)
=5²(a+b)² - 4²(a-b)²
=(5(a+b))² - (4(a-b))²
= (5a+5b)² - (4a-4b)²
= [(5a+5b)+(4a-4b)][(5a+5b)-(4a-4b)]
=(5a+5b+4a-4b)(5a+5b-4a+4b)
=(9a+b)(a+9b)
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thank u
plzzz like nd mark me brainlist
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