book Maths Puzzle Numerical Ability

what is
a^2-9a+14
3x^2+13x+4
3z^2-17z+20
4x^2-12+9

and solve for x 6x^2=63-13x

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book Other Question

I need help please! Rewrite the equation 4x+4y=20 in slope-intercept form?
This is a multiple choice A.4x+4y-20=0 B.x+y=5 C.y=-x+5 D. 4y=-4x+20? A flower bed is in the shape of a rectangle. Its length is twice its width. The bed is surrounded by a walkway 4 feet wide. If the area of the walkway is exactly twice the area of the bed, find the dimensions of the bed.