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= 10² - (3a)²
= (10 - 3a)(10 + 3a)
b) 64x² - 49y²
= (8x)² - (7y)²
= (8x - 7y)(8x + 7y)
100-9a²
=10²-(3a)²
=(3a+10)(3a-10)
b.
64x²-49y² bentuk formula nya (a-b)(a+b)=a²-b²
= (8x)²-(7y)²
=(8x-7y)(8x+7y)
;)