Question

ANSWER+EXPLANATION=100POINTS+BRAINLIEST

Answer 1

Hope you could understand.

If you have any query, feel free to ask.

Answer 2

The proof that the area of the trapezium is 2x² + x -351 = 0 can be seen in the image attached below.

What is a trapezium?

A trapezium is a quadrilateral that has a pair of opposite parallel sides.

From the given diagram:

The area of the trapezium can be computed as;

$\mathbf{= \dfrac{1}{2} \times (sum \ of \ the \ parallel \ sides) \times height }$

$\mathbf{351= \dfrac{1}{2} \times (x-4 + x +5) \times 2x }$

$\mathbf{351= \dfrac{1}{2} \times (2x+1) \times 2x }$

$\mathbf{351= (2x+1) \times x }$

351 = 2x² + x

2x² +x - 351 = 0    : Proved

Learn more about the area of trapezium here:
brainly.com/question/16904048