Blathnaid's copy of spørsmål 6

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Question 1

Andregradslikningen $ax^2+bx+c=0$ har løsningene

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a},\space \text{når}\space b^2-4ac\geq0\text{.}$

Dersom andregradsuttrykket $ax^2+bx+c$ har nullpunktene $x=x_{1}$ og $x=x_{2}$ kan det faktoriseres til $a(x-x_{1})(x-x_{2}).$

a)

Løs andregradslikningen $\simplify{x^2 +{r1+r2}x+{r1*r2}}=0\text{.}$

Skriv svaret nedenfor som $x_1$ og $x_2$ , da $x_1<x_2$

$x_1=$ (NB: $x_1<x_2$ )

$x_2=$ Expected answer:

Score: 0/1

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b)

Faktoriser andregradsuttrykket $\simplify{x^2 +{r1+r2}x+{r1*r2}}\text{.}$

$\simplify{x^2 +{r1+r2}x+{r1*r2}}$ =interpreted as $\displaystyle{}$ Expected answer:interpreted as $\displaystyle{\left ( x + 4 \right ) \left ( x - 7 \right )}$

Score: 0/1

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c)

Løs ulikheten $\simplify{x^2 +{r1+r2}x+{r1*r2}}>0\text{.}$

Svar:

$x>$ Expected answer:

Gap 2

Og
eller

Expected answer:

Og
eller

$x<$ Expected answer:

Score: 0/3

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Advice

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Blathnaid's copy of spørsmål 6

a)

b)

c)

Gap 2

Advice