5*(x-3)+7(2x+5)=2(x-7)

Объяснение:

5*(x-3)+7(2x+5)=2(x-7)

5x-15+14x+35=2x-14

5x-15+14x+35-2x+14=0

17x+34=0

17x= -34

x= -2

<var>(x−5)

2

=5x

2

−(2x−1)(2x+1)</var>

< var > x^{2}-10x+25=5x^{2}-(4x^{2}-1) < /var ><var>x

2

−10x+25=5x

2

−(4x

2

−1)</var>

< var > x^{2}-10x+25=5x^{2}-4x^{2}+1 < /var ><var>x

2

−10x+25=5x

2

−4x

2

+1</var>

< var > x^{2}-10x+25=x^{2}+1 < /var ><var>x

2

−10x+25=x

2

+1</var>

< var > x^{2}+1-x^{2}+10x-25=0 < /var ><var>x

2

+1−x

2

+10x−25=0</var>

< var > (x^{2}-x^{2})+10x+(1-25)=0 < /var ><var>(x

2

−x

2

)+10x+(1−25)=0</var>

< var > 10x-24=0 < /var ><var>10x−24=0</var>

< var > 10x=24 < /var ><var>10x=24</var>

< var > x=24:10 < /var ><var>x=24:10</var>

< var > x=2,4 < /var ><var>x=2,4</var>

< var > (2,4-5)^{2}=5\cdot(2,4)^{2}-(2\cdot2,4-1)\cdot(2\cdot2,4+1) < /var ><var>(2,4−5)

2

=5⋅(2,4)

2

−(2⋅2,4−1)⋅(2⋅2,4+1)</var> (это проверка)

< var > (-2,6)^{2}=5\cdot5,76-(4,8-1)\cdot(4,8+1) < /var ><var>(−2,6)

2

=5⋅5,76−(4,8−1)⋅(4,8+1)</var>

< var > 6,76=28,8-3,8\cdot5,8 < /var ><var>6,76=28,8−3,8⋅5,8</var>

< var > 6,76=28,8-22,04 < /var ><var>6,76=28,8−22,04</var>

< var > 6,76=6,76 < /var ><var>6,76=6,76</var>