Объяснение:
а)
[tex]3x(x - 5) - 5x(x + 3) =3x^{2}-15x-5x\left(x+3\right) =3x^{2}-15x-5x^{2}-15x =-2x^{2}-15x-15x =-2x^{2}-30x [/tex]
б)
[tex](5a - 7) {}^{2} = 25a {}^{2} - 70a + 49[/tex]
в)
[tex](3 - 2a)(2a + 3) = 3 {}^{2} - (2a) {}^{2} = 9 - (2a) {}^{2} = 9 - 2 {}^{2}a {}^{2} = 9 - 4a {}^{2} [/tex]
г)
[tex](5 + b)(25 - 5b + b {}^{2} ) = 125 + b {}^{3} [/tex]
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Объяснение:
а)
[tex]3x(x - 5) - 5x(x + 3) =3x^{2}-15x-5x\left(x+3\right) =3x^{2}-15x-5x^{2}-15x =-2x^{2}-15x-15x =-2x^{2}-30x [/tex]
б)
[tex](5a - 7) {}^{2} = 25a {}^{2} - 70a + 49[/tex]
в)
[tex](3 - 2a)(2a + 3) = 3 {}^{2} - (2a) {}^{2} = 9 - (2a) {}^{2} = 9 - 2 {}^{2}a {}^{2} = 9 - 4a {}^{2} [/tex]
г)
[tex](5 + b)(25 - 5b + b {}^{2} ) = 125 + b {}^{3} [/tex]