exam Maths Puzzle Numerical Ability

Please help with this.

Use the Quadratic Formula to solve the quadratic equation.

7/8x^2 - 3/4x + 5/16 = 0

thank you

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exam Other Question

Evalute the expression when x=-1, x=0, and x=1. Then determine whether the result is a whole number, an integer, or a rational number.

x2+1
_____
x-3
ABC is an acute triangle with cosA=1/3 and cosB=1/4.
Find cos(A+B)