write the equations x(x-9)+20 =0 in quadratic form and then solve it by factoring?

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2007-07-25 12:11:26 · 3 answers · asked by peaches 1 in Science & Mathematics ➔ Mathematics

x(x-9)+20 =0
x^2 - 9x + 20 = 0 ----- quadratic form

x^2 - 9x + 20 = 0
x^2 - 4x - 5x + 20 = 0
x(x-4) -5(x-4) = 0
(x-4)(x-5) = 0

x = {4, 5}

2007-07-25 12:15:50 · answer #1 · answered by gudspeling 7 · 0⤊ 0⤋

X (X-9) + 20 = 0
X^2 - 9X + 20 = 0
(X - 4) (X - 5) = 0
X = 4
X = 5

2007-07-25 19:20:29 · answer #2 · answered by zahbudar 6 · 0⤊ 0⤋

x^2 - 9x + 20 = 0

x^2 - 5x - 4x + 20 = 0

x(x-5) - 4(x-5) = 0

(x - 4)(x - 5) = 0

x = 4 or x = 5

2007-07-25 19:21:07 · answer #3 · answered by David T 4 · 0⤊ 0⤋