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(2a-5)(2a+5)=0
4a^2+10a-10a-25=0
4a^2-25=0
4a2 = 2a & 2a
25= 5x5
pakai cara :
a2-b2=(a-b) x (a+b)
maka hasilnya:
(2a−5) x (2a+5)