a) w1f(ξ1)
b) σ=εD
c) Nt=(1-ξ)(1-η)
d) Constant matrix
Answer: a
Explanation: In elementary algebra, the quadratic formula is the solution of the quadratic equation. There are other ways to solve the quadratic equation instead of using the quadratic formula, such as factoring, completing the square, or graphing. This is seen to be the familiar midpoint rule.
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