Whakaoti i te (-7-4i)(-12-7i)

$$( - 7 - 4 i ) ( - 12 - 7 i )$$

Aromātai

$$56+97i$$

Ngā Upane Otinga

Me whakarea ngā tau matatini -7-4i me -12-7i pēnā i te whakarea huarua.

$$-7\left(-12\right)-7\times \left(-7i\right)-4i\left(-12\right)-4\left(-7\right)i^{2}$$

Hei tōna tikanga, ko te i^{2} ko -1.

$$-7\left(-12\right)-7\times \left(-7i\right)-4i\left(-12\right)-4\left(-7\right)\left(-1\right)$$

Mahia ngā whakarea.

$$84+49i+48i-28$$

Whakakotahitia ngā wāhi tūturu me ngā wāhi pōhewa.

$$84-28+\left(49+48\right)i$$

Mahia ngā tāpiri.

$$56+97i$$

Wāhi Tūturu

$$56$$

Ngā Upane Otinga

Me whakarea ngā tau matatini -7-4i me -12-7i pēnā i te whakarea huarua.

$$Re(-7\left(-12\right)-7\times \left(-7i\right)-4i\left(-12\right)-4\left(-7\right)i^{2})$$

Hei tōna tikanga, ko te i^{2} ko -1.

$$Re(-7\left(-12\right)-7\times \left(-7i\right)-4i\left(-12\right)-4\left(-7\right)\left(-1\right))$$

Mahia ngā whakarea i roto o -7\left(-12\right)-7\times \left(-7i\right)-4i\left(-12\right)-4\left(-7\right)\left(-1\right).

$$Re(84+49i+48i-28)$$

Whakakotahitia ngā wāhi tūturu me ngā wāhi pōhewa ki 84+49i+48i-28.

$$Re(84-28+\left(49+48\right)i)$$

Mahia ngā tāpiri i roto o 84-28+\left(49+48\right)i.

$$Re(56+97i)$$

Ko te wāhi tūturu o 56+97i ko 56.

$$56$$