Question

c) ( 3 -radical din 3) (3+radical din 3)? Vreau si eu un răspuns?

Answer 1

$(3 - \sqrt{3} )(3 + \sqrt{3} ) = {3}^{2} - {( \sqrt{3} )}^{2} = 9 - 3 = 6$

$Formul\check{a}\::(a - b)(a + b) = {a}^{2} - {b}^{2}$

$(2\sqrt{3}-5)(2\sqrt{3}+5)={(2\sqrt{3})}^{2}-{5}^{2}$

$={2}^{2}\times3-25$

$=4\times3-25$

$=12-25$

$=-13$

$Formul\check{a}\::\:(a-b)(a+b)={a}^{2}-{b}^{2}$

$(x+1)(x+4)=x \times x+x \times 4+1\times x+1\times4$

$={x}^{2}+4x+x+4$

$={x}^{2}+5x+4$

$(x-6)(2x-5)=x\times2x+x\times(-5)-6\times2x-6\times(-5)$

$=2{x}^{2}-5x-12x+30$

$=2{x}^{2}-17x+30$

Answer 2

Acesta e răspunsul la întrebarea ta