What is the sum of the coefficients in the expression of 4x^4 - x^3 - 2x^2 + 3 - 4

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are: