exam Maths Puzzle Numerical Ability

Can anyone help me with this?

5x^2+3x+5=0

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exam Other Question

The length of a rectangle is 3 Inches more than its width. The perimeter of the rectangle is 30 inches. the variables x and y vary directly.use the given values to write an equation that relates x and y

x=5,y=40

i have no clue how to do it