Question

solve the following quadratic equation by completing the square method
(1)x2+x-20=0​

Answer 1

Answer:

x= 4 or -5

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Answer 2

${x}^{2} + x - 20 = 0$

${x}^{2} + (5 - 4)x - 20$

${x}^{2} + 5x - 4x - 20$

$x(x + 5) - 4(x + 5)$

$(x + 5)(x - 4)$

$x + 5 = 0$

$x = - 5$

$x - 4 = 0$

$x = 4$