arcsin(sin257')<span>=-0.610597594 </span>
5x - 5 - 4x + 12 = - 20
x = - 20 - 7
x = - 27
8b² - 4b³ + 10b⁴ = 10b⁴ - 4b³ + 8b² = 2b²( 5b² - 2b + 4)
(5a-3x)^3 = (5a-3x)(5a-3x)(5a-3x) = (5a-3x)(25a^2-15ax-15ax+9x^2) =
= (5a-3x)(25a^2-30ax+9x^2) = 125a^3-150<u>a^2</u>x+45a<u>x^2</u>-75<u>a^2</u>x+90a<u>x^2</u>-27x^3 =
= 125a^3-225a^2x+135ax^2-27x^3
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(a-b)^3 = a^3-3a^2b+3ab^2-b^3
(5a-3x)^3 = (5a)^3-3*(5a)^2*3x+3*5a*(3x)^2-(3x)^3 =
= 125a^3-25a^2*9x+15a*9x^2-27x^3 =
= 125a^3-225a^2x+135ax^2-27x^3