Question

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Answer 1

Respuesta:

a.

${x}^{2} + 5x - 36 = (x + 9)(x - 4)$

x + 9 = 0 x - 4 = 0

x = -9 x = 4

b.

${a}^{2} - a - 12 = (a + 3)(a - 4)$

a + 3 = 0 a - 4 = 0

a = -3 a = 4

c.

${x}^{2} - 8x - 20 = (x + 2)(x - 10)$

x + 2 = 0 x - 10 = 0

x = -2 x = 10

d.

${x}^{2} + 2x - 15 = (x + 5)(x - 3)$

x + 5 = 0 x - 3 = 0

x = -5 x = 3

e.

${a}^{2} - 13a + 40 = (a - 8)(a - 5)$

a - 8 = 0 a - 5 = 0

a = 8 a = 5

f.

${z}^{2} + 10z + 10 =$