-2,6*(6+5х)-1,5=-21 (х-1,8)*х=3х

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вопрос

Expanding the expression on the left side:

-2 - 30 - 30x - 1.5 = -21(x - 1.8) * x

-32 - 30x - 1.5 = -21x^2 + 37.8x

Combine like terms:

-33.5 - 30x = -21x^2 + 37.8x

Rearrange the equation to set it equal to zero:

21x^2 - 67.8x - 33.5 = 0

Now, we can solve for x using the quadratic formula:

x = (-(-67.8) ± √((-67.8)^2 - 421(-33.5))) / 2*21

x = (67.8 ± √(4591.76 + 2821.4)) / 42

x = (67.8 ± √7413.16) / 42

x = (67.8 ± 86.08) / 42

Two possible solutions:

x1 = (67.8 + 86.08) / 42 = 3.837

x2 = (67.8 - 86.08) / 42 = -0.885

Therefore, the possible solutions for x are x1 = 3.837 and x2 = -0.885.