1) (4a+9c)²-36ac
2) (18a+4c)²+19ac
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1)(4a+9c)^2-36ac
=16a^2+72ac+81c^2-36ac
=16a^2+36ac+81c^2
=(4a+9c)^2
2)(18a+4c)^2+19ac
=324a^2+144ac+16a^2+19ac
=324c^2+153ac+16a^2
=16a^2+72ac+81c^2-36ac
=16a^2+36ac+81c^2
=(4a+9c)^2
2)(18a+4c)^2+19ac
=324a^2+144ac+16a^2+19ac
=324c^2+153ac+16a^2
rama16:
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