exam Maths Puzzle Numerical Ability

I can not add using the vertical method help!

5x^2+2x-4,x^2-2x-3 and 2x^2-4x-3

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exam Other Question

i need help and i don't understand Can someone help me please?

The width of a rectangular is 4ft. less than the length. The area is 5ft.^2. Find the length and the width.

Thank you.