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Va rog rapid 5 :) dau coroana.​

Va Rog Rapid 5 Dau Coroana class=

Răspuns :

[tex]a) {x}^{2} + 3x + 2 = {x}^{2} + x + 2x + 2 = x(x + 1) + 2(x + 1) = (x + 1)(x + 2)[/tex]

[tex]b) {x}^{2} + 5x + 4 = {x}^{2} + x + 4x + 4 = x(x + 1) + 4(x + 1) = (x + 1)(x + 4)[/tex]

[tex]c) {x}^{2} + 8x + 7 = {x}^{2} + x + 7x + 7 = x(x + 1) + 7( x+ 1) = (x + 1)(x + 7)[/tex]

[tex]d) {x}^{2} + 7x + 12 = {x}^{2} + 3x + 4x + 12 = x(x + 3) + 4(x + 3) = (x + 3)(x + 4)[/tex]

[tex]e) {x}^{2} + 6x + 8 = {x}^{2} + 2x + 4x + 8 = x(x + 2) + 4(x + 2) = (x + 2)(x + 4)[/tex]

[tex]f) {x}^{2} + 8x + 15 = {x}^{2} + 3x + 5x + 15 = x(x + 3) + 5(x + 3) = (x + 3)(x + 5)[/tex]

[tex]g) {x}^{2} + 9x + 14 = {x}^{2} + 2x + 7x + 14 = x(x + 2) + 7(x + 2) = (x + 2)(x + 7)[/tex]

[tex]h) {x}^{2} + 10x + 21 = {x}^{2} + 3x + 7x + 21 = x(x + 3) + 7(x + 3) = (x + 3)(x + 7)[/tex]

[tex]i) {x}^{2} + 6x + 5 = {x}^{2} +x + 5x + 5 = x(x + 1) + 5(x + 1) = (x + 1)(x + 5)[/tex]