Question 608163
}}}(x^2)(-2x^2)}}} the adjoining parentheses means multiply
both coefficients and terms
{{{(x^2)(-2x^2) = -2x^4}}}
{{{(5x^3)(3x^2) = 15x^5}}}
...
{{{x^2 - 2x^2}}} is subtracting the coefficients of the like terms
{{{1x^2 - 2x^2 = -1x^2}}}
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