21) Solve by using Quadratic formula: x²-5x+4 =0
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x²-5x+4 =0
x² -(4x+x) +4 =0
x² - 4x - x +4= 0
x(x-4) - (x-4) = 0
(x-4)(x-1) = 0
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this is your answer Thankyou
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