Isabelle H.
asked • 10/28/16Solving an equation two ways
Solve √5-x=2x both graphically and algebraically.
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1 Expert Answer
Kenneth S. answered • 10/29/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
√(5-x)=2x
square both sides; now you have 5-x=4x2
or 4x2 +x -5 = 0
Factor: (4x+5)(x-1) = 0
which appears to have two roots (zeros): 1 and -5/4.
Obviously the latter of these does NOT satisfy the original equation. The other one (1) is the solution.
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Mark M.
10/28/16