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Substituting and evaluating algebraic expressions questions and answers

What is the value of #frac{a(bc-d^2)}{a^2+b^2}#
if a=2, b=4,c=8 and d=5?
A.#7/18#

B.#7/10#

C. #3 2/3#

D.#1 19/20#

(2m 26s)

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