using suitable identities ,find following products : (3x+4)(3x-5)
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(3x+4)(3x-5)
=3x^+3x (4-5)-4×5
=3x^+12x-15x-20
=3x^-3x-20
=3x^+3x (4-5)-4×5
=3x^+12x-15x-20
=3x^-3x-20
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