Mathematics

Mathematics, 26.09.2019 05:00, babydolltia28

After being rearranged in simplified, which of the following equations could be solved using the quadratic formula? check all that apply.
a. 2x^2+x^2+x=30
b. -x^2+4x+7= -x^2-9
c. 5x+4=3x^4-2
d. 9x+3x^2=14+x-1

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