Explicação passo-a-passo:
[tex](1 \: . \: 5)[/tex]
[tex]d) \: \: 2.5[/tex]
[tex] {4x}^{2} = 36[/tex]
[tex] {x}^{2} = \frac{36}{4} [/tex]
[tex] {x}^{2} = 9[/tex]
[tex]x = \sqrt{9} [/tex]
[tex]x1 = 3 \\ x2 = - 3[/tex]
[tex] {7x}^{2} - 21 = 0[/tex]
[tex] {7x}^{2} = 21[/tex]
[tex] {x}^{2} = \frac{21}{7} [/tex]
[tex] {x}^{2} = 3[/tex]
[tex]x = \sqrt{3} [/tex]
[tex]x1 = \sqrt{3 \\ } \\ x2 = - \sqrt{3} [/tex]
[tex] {x}^{2} + 9 = 0[/tex]
[tex] {x}^{2} = - 9[/tex]
[tex]x = \sqrt{ - 9} [/tex]
[tex]x1 = 3i \\ x2 = - 3i[/tex]
[tex] {x}^{2} - 49 = 0[/tex]
[tex] {x}^{2} = 49[/tex]
[tex]x = \sqrt{49} [/tex]
[tex]x1 = 7 \\ x2 = - 7[/tex]
[tex]{5x}^{2} - 20 = 0[/tex]
[tex]{x}^{2} - 4 = 0[/tex]
[tex] {x}^{2} = 4[/tex]
[tex]x = \sqrt{4} [/tex]
[tex]x1 = 2 \\ x2 = - 2[/tex]
[tex] 2{x}^{2} - 288 = 0[/tex]
[tex] 2{x}^{2} = 288[/tex]
[tex] {x}^{2} = \frac{288}{2} [/tex]
[tex] {x}^{2} = 144[/tex]
[tex]x = \sqrt{144} [/tex]
[tex]x1 = 12 \\ x2 = - 12[/tex]
[tex]5 {x}^{2} - 20x = 0[/tex]
[tex]5x \times (x - 20) = 0[/tex]
[tex]x \times (x - 20) = 0[/tex]
[tex]x = 0 \\ x - 4 = 0[/tex]
[tex]x = 4[/tex]
[tex]x1 = 4 \\ x2 = 0[/tex]
[tex] {x}^{2} - 10x = 0[/tex]
[tex]x \times (x - 10) = 0[/tex]
[tex]x = 0 \\ x - 10 = 0[/tex]
[tex]x1 = 10 \\ x2 = 0[/tex]
[tex] {3x}^{2} + 18x = 0[/tex]
[tex]3x \times (x + 6) = 0[/tex]
[tex]x = 0 \\ x + 6 = 0[/tex]
[tex]x = - 6[/tex]
[tex]x1 = - 6 \\ x2 = 0[/tex]
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Lista de comentários
Explicação passo-a-passo:
1-)
[tex](1 \: . \: 5)[/tex]
2-)
[tex]d) \: \: 2.5[/tex]
3-)
a-)
[tex] {4x}^{2} = 36[/tex]
[tex] {x}^{2} = \frac{36}{4} [/tex]
[tex] {x}^{2} = 9[/tex]
[tex]x = \sqrt{9} [/tex]
[tex]x1 = 3 \\ x2 = - 3[/tex]
b-)
[tex] {7x}^{2} - 21 = 0[/tex]
[tex] {7x}^{2} = 21[/tex]
[tex] {x}^{2} = \frac{21}{7} [/tex]
[tex] {x}^{2} = 3[/tex]
[tex]x = \sqrt{3} [/tex]
[tex]x1 = \sqrt{3 \\ } \\ x2 = - \sqrt{3} [/tex]
c-)
[tex] {x}^{2} + 9 = 0[/tex]
[tex] {x}^{2} = - 9[/tex]
[tex]x = \sqrt{ - 9} [/tex]
[tex]x1 = 3i \\ x2 = - 3i[/tex]
d-)
[tex] {x}^{2} - 49 = 0[/tex]
[tex] {x}^{2} = 49[/tex]
[tex]x = \sqrt{49} [/tex]
[tex]x1 = 7 \\ x2 = - 7[/tex]
e-)
[tex]{5x}^{2} - 20 = 0[/tex]
[tex]{x}^{2} - 4 = 0[/tex]
[tex] {x}^{2} = 4[/tex]
[tex]x = \sqrt{4} [/tex]
[tex]x1 = 2 \\ x2 = - 2[/tex]
f-)
[tex] 2{x}^{2} - 288 = 0[/tex]
[tex] 2{x}^{2} = 288[/tex]
[tex] {x}^{2} = \frac{288}{2} [/tex]
[tex] {x}^{2} = 144[/tex]
[tex]x = \sqrt{144} [/tex]
[tex]x1 = 12 \\ x2 = - 12[/tex]
g-)
[tex]5 {x}^{2} - 20x = 0[/tex]
[tex]5x \times (x - 20) = 0[/tex]
[tex]x \times (x - 20) = 0[/tex]
[tex]x = 0 \\ x - 4 = 0[/tex]
[tex]x = 4[/tex]
[tex]x1 = 4 \\ x2 = 0[/tex]
h-)
[tex] {x}^{2} - 10x = 0[/tex]
[tex]x \times (x - 10) = 0[/tex]
[tex]x = 0 \\ x - 10 = 0[/tex]
[tex]x1 = 10 \\ x2 = 0[/tex]
i-)
[tex] {3x}^{2} + 18x = 0[/tex]
[tex]3x \times (x + 6) = 0[/tex]
[tex]x = 0 \\ x + 6 = 0[/tex]
[tex]x = - 6[/tex]
[tex]x1 = - 6 \\ x2 = 0[/tex]