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−15x2 − 21x + 18 =?

Which property is illustrated by the statement given below? raj raj.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?