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x la a doua minus 7x minus 30 egal x la a doua minus 9 x minus 52​

Răspuns :

[tex] {x}^{2} - 7x - 30 = {x}^{2} - 9x - 52[/tex]

[tex]{x}^{2} - {x}^{2} - 7x - 30 = - 9x - 52[/tex]

[tex] - 7x - 30 = - 9x - 52[/tex]

[tex]- 7x + 9x - 30 = - 52[/tex]

[tex]2x - 30 = - 52[/tex]

[tex]2x = - 52 + 30[/tex]

[tex]2x = - 22[/tex]

[tex]x = - 22 \div 2 = - 11[/tex]

Maas10

Răspuns:

x²-7x-30=x²-9x-52

eliminam x² (termenii care sunt egali)

=> -7x-30=-9x-52

-7x+9x=-52+30

2x=-52+30

2x= -22

x= -22:2

x = - 11