19.4 Ontbinden >

Hoofdstukken > Ontbinden pilot

Herhaling

Oefenen

1

$28 \cdot 37 = (20 + 8) (30 + 7) = 20 \cdot 30 + 20 \cdot 7 + 8 \cdot 30 + 8 \cdot 7 = 1036$

2

$x^{2} + 4 x$	$4 x - 2 x^{2}$
$x^{2} + 9 x + 20$	$x^{2} - x - 20$
$x^{2} - 9 x + 20$	$2 x^{2} - 6 x - 20$
$x^{2} + 8 x + 16$	$4 x^{2} - 16 x + 16$

3

4

$x (x + 7)$	$(x + 2) (x + 3)$
$(x - 5) (x + 1)$	$(x - 1) (x + 7)$
$(x - 2) (x - 5)$	$x^{2} (x - 7)$
${(x - 3)}^{2}$	$(x - 10) (x + 10)$

3s

4s

a

$k = ‐ 15$	$x^{2} - 15 x - 16 = (x - 16) (x + 1)$
$k = ‐ 6$	$x^{2} - 6 x - 16 = (x - 8) (x + 2)$
$k = 0$	$x^{2} - 16 = (x - 4) (x + 4)$
$k = 15$	$x^{2} + 15 x - 16 = (x - 1) (x + 16)$

b

$k = ‐ 17$ of $k = 0$ of $k = 15$